RX630 Group Application Note Reducing Power Consumption
Contents
1. 3 3 2 BCLK Output When Using a Low Power Consumption Mode When the external bus is enabled and the SCKCR PSTOP 1 bit is 0 BCLK pin output is enabled BCLK output is stopped in software standby mode and deep software standby mode and the BCLK pin outputs a high but BCLK output is not stopped in sleep mode or all module clock stop mode When BCLK is output power consumption increases so if BCLK output is not needed while the MCU is in sleep mode or all module clock stop mode set the PSTOP1 bit to 1 BCLK pin output is disabled always output the high level before entering sleep mode or all module clock stop mode 3 3 3 Transitioning to a Low Power Consumption Mode During D A Conversion When the RX630 Group enters the module stop state or software standby mode with D A conversion enabled the analog outputs are retained and the analog power supply current is the same as during D A conversion If the analog power supply current has to be reduced in the module stop state or software standby mode disable analog output by setting bits DACR DAOE1 DAOEO and DAE to 0 When the MCU enters deep software standby mode the analog output pin is placed in a high impedance state For details refer to section 40 4 3 Operation of the D A Converter in Software Standby Mode in the user s manual 3 3 4 Transitioning to a Low Power Consumption Mode During A D Conversion S12AD and AD Modules If the MCU enters the module stop state with A D conversion e2. 00 Page 14 of 14 Apr 1 2014 RENESAS RX630 Group Application Note Reducing Power Consumption Rev Date Description Page Summary REVISION HISTORY Apr 1 2014 First edition issued All trademarks and registered trademarks are the property of their respective owners General Precautions in the Handling of MPU MCU Products The following usage notes are applicable to all MPU MCU products from Renesas For detailed usage notes on the products covered by this document refer to the relevant sections of the document as well as any technical updates that have been issued for the products 1 Handling of Unused Pins Handle unused pins in accordance with the directions given under Handling of Unused Pins in the manual The input pins of CMOS products are generally in the high impedance state In operation with an unused pin in the open circuit state extra electromagnetic noise is induced in the vicinity of LSI an associated shoot through current flows internally and malfunctions occur due to the false recognition of the pin state as an input signal become possible Unused pins should be handled as described under Handling of Unused Pins in the manual 2 Processing at Power on The state of the product is undefined at the moment when power is supplied The states of internal circuits in the LSI are indeterminate and the states of register settings and pins are undefined at the moment when power is supplied In a
3. Clocks Power consumption can be reduced by stopping as many of the following as possible main clock oscillator sub clock oscillator high speed on chip oscillator HOCO low speed on chip oscillator LOCO PLL circuit and IWDT dedicated on chip oscillator Refer to the user s manual for notes on stopping clocks 2 2 Clock Frequencies Power consumption can be reduced by lowering the frequencies of the following clocks system clock ICLK peripheral module clock PCLKB external bus clock BCLK and the flash interface clock FCLK When clocks are not used e g when not using the external bus power consumption can be reduced by setting the frequency division ratio to 64 the maximum frequency division ratio 2 3 Power Supply for the HOCO Set the HOCOPCR HOCOPCNT bit to 1 to turn off the power supply of the HOCO 2 4 Operating Power Consumption Control Modes Power consumption can be reduced by selecting an appropriate operating power consumption control mode according to the clock operating frequency and operating voltage The three operating power control modes in the RX630 Group are high speed operating mode low speed operating mode 1 and low speed operating mode 2 When transitioning to another mode follow the procedure in the user s manual in section 11 5 1 Setting Operating Power Consumption Control Mode to set the OPCCR register 2 4 1 High Speed Operating Mode This mode allows high speed operation After a res
4. I O ports CPU Stopped WDT Figure 3 1 shows the Procedure to Enter Sleep Mode PSWibit 0 Confirm that the value just written to the register can be read Execute WAIT instruction Sleep mode Processing after exiting sleep mode Figure 3 1 Procedure to Enter Sleep Mode RO1AN1293EJ0100 Rev 1 00 Page 5 of 14 Apr 1 2014 RENESAS RX630 Group Reducing Power Consumption 3 1 2 All Module Clock Stop Mode To enter all module clock stop mode set the MSTPCAR ACSE bit to 1 and put modules controlled by registers MSTPCRA MSTPCRB and MSTPCRC in the module stop state set the SBYSC SSBY bit to 0 then execute the WAIT instruction Note 1 Set the MSTPCRA register to FFFF FF C F Fh set the MSTPCRB register to FFFF FFFFh and set bits MSTPCRC MSTPC 31 16 to FFFFh Table 3 3 lists the Operating Status of Various Functions While the MCU is in All Module Clock Stop Mode Table 3 3 Operating Status of Various Functions While the MCU is in All Module Clock Stop Mode Main clock oscillator sub clock oscillator HOCO LOCO PLL IWDT dedicated on chip oscillator Power on reset circuit LVD Operating TMR RTC IWDT USB USB resumption only CPU RAMO data retained RAM1 data retained Flash memory Peripheral modules except those listed in the Operating row above Bus controller I O ports Stopped Figure 3 2 shows the Procedure to Enter All Module Clock Stop Mode Settings to enter all mod
5. RENESAS RX630 Group Reducing Power Consumption 3 1 4 Deep Software Standby Mode If the WAIT instruction is executed while the SBYCR SSBY bit is set to 1 and the DSPBYCR DPSBY bit is set to 1 the MCU enters deep software standby mode Table 3 5 lists the Operating Status of Various Functions While the MCU is in Deep Software Standby Mode Table 3 5 Operating Status of Various Functions While the MCU is in Deep Software Standby Mode Main clock oscillator sub clock oscillator Power on reset circuit Operating LVD RTC USB only the USB suspend resume detecting unit CPU HOCO LOCO IWDT dedicated on chip oscillator PLL RAM1 data undefined RAMO data retained While in deep software standby mode data retention can be selected by setting the Stopped DPSBYCR DEEPCUT 1 0 bits Flash memory Peripheral modules except those that are operating Bus controller I O ports RO1AN1293EJ0100 Rev 1 00 Page 9 of 14 Apr 1 2014 RENESAS RX630 Group Reducing Power Consumption Figure 3 4 shows the Procedure to Enter Deep Software Standby Mode Settings to enter deep software standby mode PRCR register PRCO bit PRC1 bit Enable writing SBYCR register SSBY bit lt 1 DPSBYCR register Set the DPSBYCR DEEPCUT 1 0 ese bits Select deep software standby mode PODR register Configure I O ports PDR register Configure the bus pins when using SBYCR register a low power consumption mode OPE bit DPSBYCR r
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7. finished product where the reset signal is applied to the external reset pin the states of pins are not guaranteed from the moment when power is supplied until the reset process is completed In a similar way the states of pins in a product that is reset by an on chip power on reset function are not guaranteed from the moment when power is supplied until the power reaches the level at which resetting has been specified 3 Prohibition of Access to Reserved Addresses Access to reserved addresses is prohibited The reserved addresses are provided for the possible future expansion of functions Do not access these addresses the correct operation of LSI is not guaranteed if they are accessed 4 Clock Signals After applying a reset only release the reset line after the operating clock signal has become stable When switching the clock signal during program execution wait until the target clock signal has stabilized When the clock signal is generated with an external resonator or from an external oscillator during a reset ensure that the reset line is only released after full stabilization of the clock signal Moreover when switching to a clock signal produced with an external resonator or by an external oscillator while program execution is in progress wait until the target clock signal is stable 5 Differences between Products Before changing from one product to another i e to a product with a different part number confirm
8. for Returning From a Low Power Consumption Mode and Power Consumption The time for returning from a low power consumption mode is dependent which low power consumption mode the MCU entered and the ICLK before the MCU entered the aforementioned low power consumption mode Use a low power consumption mode appropriate to the specifications of the user program Table 3 6 lists the Correspondence Between the Time for Returning From a Low Power Consumption Mode and Power Consumption Table 3 6 Correspondence Between the Time for Returning From a Low Power Consumption Mode and Power Consumption Low Power Consumption Mode Return Time Power Consumption Sleep mode All module clock stop mode Software standby mode Deep software standby mode Note 1 This column shows a comparison of the ICLK in any mode before entering a low power consumption mode RO1AN1293EJ0100 Rev 1 00 Page 11 of 14 Apr 1 2014 RENESAS RX630 Group Reducing Power Consumption 3 3 Notes on Using Low Power Consumption Modes 3 3 1 DMAC and DTC Status When Transitioning to a Low Power Consumption Mode When entering the all module clock stop mode software standby mode or deep software standby mode set the DMAST DMST bit to 0 DMAC activation is disabled and set the DTCST DTCST bit to 0 DTC module stop For more information refer to section 18 6 Low Power Consumption Function and section 19 8 Low Power Consumption Function in the user s manual
9. 2rPENESAS APPLICATION NOTE RX630 Group RO1AN1293EJ0100 Rev 1 00 Reducing Power Consumption Apr 1 2014 Abstract This document describes a method of reducing power consumption for the RX630 Group Products RX630 Group When using this application note with other Renesas MCUs careful evaluation is recommended after making modifications to comply with the alternate MCU RO1AN1293EJ0100 Rev 1 00 Page 1 of 14 Apr 1 2014 RENESAS RX630 Group Reducing Power Consumption Contents 1 Using the Module Stop Function to Reduce Power Consumption ccceeeeeseceeeceeeeeeeteeseneees 3 1 1 Peripheral Modules That Support the Module Stop Function ccccccceeseceeeceeeeseeeeseeeeeeeeees 3 1 2 Peripheral Modules That Do Not Support the Module Stop Function ccceccsseeeeeeeeeeeees 3 1 2 1 Settings When Not Using the Realtime Clock esssesssrssseernessnnanaeennaannnnaneennaanannaaennaannannaa 3 1 2 2 When Not Using the Voltage Detection CirCuit ec cccceeeeeeee eee eneeeeeeeteeeeeeneeeeeeneeeeeeaes 3 2 Controlling Clocks to Reduce Power Consumption s sesssssssrrsseernassnnnantennannannnaeennaanannatennaadnannaaeann 4 2 1 Operating and Stopping Clocks 00 0 0 cece ecececeeececee eee eeeeeeee eter eee ceeaaeceeeeeeseeaaaaeeeeeeeeeseneiaeeeeeeeeeeeees 4 22 COCK FFEQUENCIES iz ieseccseeiiecesveianetceie A veieandun A E Feeds starter tevieedaentenneet aerated 4 2 3 Power Supply for
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11. Connect To Connect this pin to VCC AVCCO Connect this pin to VCC AVSSO Connect this pin to VSS VREFHO Connect this pin to VCC Analog power supply VREFLO Connect this pin to VSS VREFH Connect this pin to VCC VREFL Connect this pin to VSS USBO_DP USBO_DM Keep the pin open Keep the pin open VCC_USB Connect this pin to VCC VSS_USB Connect this pin to VSS XCIN Connect this pin to VSS through a resistor pull down XCOUT Keep the pin open EXTAL Connect this pin to VSS through a resistor pull down XTAL Interrupt Keep the pin open Connect this pin to VCC through a resistor pull up I O ports RO1AN1293EJ0100 Rev 1 00 Apr 1 2014 For general I O port pins set the input direction and connect each pin to VCC through a resistor pull up or connect each to VSS through a resistor pull down RENESAS Page 13 of 14 RX630 Group Reducing Power Consumption 5 Reference Documents User s Manual Hardware RX630 Group User s Manual Hardware Rev 1 20 RO1UH0040EJ The latest version can be downloaded from the Renesas Electronics website Technical Update Technical News The latest information can be downloaded from the Renesas Electronics website Website and Support Renesas Electronics website http Awww renesas com Inquiries http www renesas com contact RO1AN1293EJ0100 Rev 1
12. Control Mode Operating Frequency ICLK High speed operating mode 100 MHz max Low speed operating mode 1 1 MHz max Low speed operating mode 2 32 to 125 kHz RO1AN1293EJ0100 Rev 1 00 Page 4 of 14 Apr 1 2014 RENESAS RX630 Group Reducing Power Consumption 3 Using Low Power Consumption Modes to Reduce Power Consumption 3 1 Low Power Consumption Modes The RX630 Group has four low power consumption modes to help reduce power consumption Each mode drastically reduces the amount of power consumed but as the operating status differs special consideration should be given to each mode s specifications before creating the user program The Low Power Consumption Modes are listed in Table 3 1 Table 3 1 Low Power Consumption Modes Low Power Consumption Mode Power Consumed Sleep mode All module clock stop mode Software standby mode Deep software standby mode 3 1 1 Sleep Mode If the WAIT instruction is executed while the SBYCR SSBY bit is set to 0 and the MSTPCRA ACSE bit is set to 0 the MCU enters sleep mode Table 3 2 lists the Operating Status of Various Functions While the MCU is in Sleep Mode Table 3 2 Operating Status of Various Functions While the MCU is in Sleep Mode Main clock oscillator sub clock oscillator HOCO LOCO PLL IWDT dedicated on chip oscillator RAMO RAM1 Flash memory Operating Peripheral modules except for the CPU and WDT Power on reset circuit Bus controller
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15. egister Set the DPSBYCR IOKEEP bit IOKEEP bit DPSIEGRy register DPSIERy register Confirm the DPSIERy setting Clear the DPSIFRy register Set the interrupt to exit deep software standby mode Reset the CPU clock Set the source of the CPU clock to a clock other than the main clock or PLL F uati DMAST register Disable DMAC and DTC activation DMST bit lt 0 DTCST register DTCST bit lt 0 Read I O registers Confirm that the value just written to the register can be read Execute the WAIT instruction Deep software standby mode Deep software standby reset Note 1 For products with ROM capacities of at least 1 5 MB or products with at least 176 pins when selecting the main clock oscillator or PLL circuit as the clock source for the ICLK the MCU will not enter software standby mode even if the WAIT instruction is executed Switch the clock source to the LOCO HOCO or sub clock oscillator and then execute the WAIT instruction Figure 3 4 Procedure to Enter Deep Software Standby Mode 3 1 4 1 DEEPCUT 1 0 Bits When the MCU is in deep software standby mode the DPSBYCR DEEPCUT 1 0 bit setting controls the power supply to the RAM and USB resume detecting unit and also controls the LVD and power on reset circuit Refer to the user s manual for more information on settings these bits RO1AN1293EJ0100 Rev 1 00 Page 10 of 14 Apr 1 2014 RENESAS RX630 Group Reducing Power Consumption 3 2 Correspondence Between the Time
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17. et cancellation or recovery from software standby mode the LSI is activated in this mode Use the high speed operating mode when a clock faster than 1 MHz is necessary 2 4 2 Low Speed Operating Mode 1 This mode consumes less power than the high speed operating mode In this mode ICLK FCLK PCLKB and BCLK operate at 1 MHz or less The PLL and HOCO cannot be used Set the PLLCR2 PLLEN bit to 1 PLL is stopped and set the HOCOCR HCSTP bit to 1 HOCO is stopped Program and erase operations of the flash memory are disabled 2 4 3 Low Speed Operating Mode 2 This mode consumes even less power than low speed operating mode 1 In low speed operating mode 2 the ICLK FCLK PCLKB and BCLK operate at 125 kHz or less and the minimum operating frequency of the ICLK and FCLK is 32 kHz The PLL and HOCO cannot be used Set the PLLCR2 PLLEN bit to 1 PLL is stopped and set the HOCOCR HCSTP bit to 1 HOCO is stopped Program and erase operations of the flash memory ROM E2 DataFlash are disabled and the E2 DataFlash cannot be read 2 5 Correspondence Between the Operating Frequency and the Operating Power Consumption Control Modes Table 2 1 lists the operating power consumption control modes and their maximum operating frequencies Select an operating power consumption control mode appropriate to your operating frequency needs Table 2 1 Operating Frequency Limitations and Operating Power Consumption Control Modes Operating Power Consumption
18. nabled the analog power supply current is the same as during A D conversion If the module stop function must be used to reduce the analog power supply current stop A D conversion by setting the ADCSR ADST bit to 0 For details refer to section 38 5 5 Notes on Entering Low Power Consumption States and section 39 6 4 Notes on Entering Power Down States in the user s manual 3 3 5 Transitioning to a Low Power Consumption Mode During Data Transmission Reception SCI Set the SCR TIE TE RE and TIEI bits to 0 before configuring the module stop state and before transitioning to software standby mode Setting the TE bit to 0 resets registers TSR TDR and SSR When modules are in the module stop state and when the MCU is in software standby mode the status of output pins is dependent on the port settings and the pins output a high when the module stop states and software standby mode are canceled When the MCU enters a low power consumption mode while data is being transmitted the data being transmitted becomes undetermined When the MCU enters a low power consumption mode while data is being received the data being received becomes invalid RO1AN1293EJ0100 Rev 1 00 Page 12 of 14 Apr 1 2014 RENESAS RX630 Group 4 Other Processing 4 1 Handling of Unused Pins Unused pins should be connected as listed in Table 4 1 Table 4 1 Handling of Unused Pins Classification Battery backup function VBATT Reducing Power Consumption
19. pr 1 2014 RENESAS RX630 Group Reducing Power Consumption Figure 3 3 shows the Procedure to Enter Software Standby Mode Settings to enter software standby mode Disable interrupts PSW I lt lt 0 PRCR register PRCO bit PRC1 bit Enable writing SBYCR register Select software standby mode SSBY bit 1 PODR register Configure I O ports PDR register Configure the bus pins when using SBYCR register a low power consumption mode OPE bit Set the interrupt to determine the source for exit Reset the CPU clock Set the source of the CPU clock to a clock other than the main clock or PLL clock PRCR register PRCO bit PRC1 bit Disable writing uati DMAST register Disable DMAC and DTC activation DMST bit lt 0 DTCST register DTCST bit lt 0 Read I O registers Confirm that the value just written to the register can be read Execute the WAIT instruction Software standby mode Processing after exiting software standby mode Note 1 For products with ROM capacities of at least 1 5 MB or products with at least 176 pins when selecting the main clock oscillator or PLL circuit as the clock source for the ICLK the MCU will not enter software standby mode even if the WAIT instruction is executed Switch the clock source to the LOCO HOCO or sub clock oscillator and then execute the WAIT instruction Figure 3 3 Procedure to Enter Software Standby Mode R01AN1293EJ0100 Rev 1 00 Page 8 of 14 Apr 1 2014
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21. registers MSTPCRA to MSTPCRC for each peripheral module After a reset is canceled all peripheral modules other than the DMAC DTC and RAM are placed in the module stop state Transition these modules to the module stop state as needed DMAC DTC Set the MSTPCRA MSTPA28 bit to toggle the module stop state RAMO Set the MSTPCRC MSTPCO bit to toggle the module stop state RAMI Set the MSTPCRC MSTPC1 bit to toggle the module stop state 1 2 Peripheral Modules That Do Not Support the Module Stop Function Some peripheral modules do not support the module stop function When not using these peripheral modules their operation should be stopped 1 2 1 Settings When Not Using the Realtime Clock As registers in the realtime clock RTC are not initialized after a reset values after a reset may cause unintentional interrupt requests to be generated or as counters are operating power consumption may increase When not using the RTC follow the initialization process described in the user s manual to initialize the registers 1 2 2 When Not Using the Voltage Detection Circuit When not using the voltage detection circuit LVD set bits LVCMPCR LVDIE and LVD2E to 0 voltage detection 1 circuit disabled and voltage detection 2 circuit disabled respectively RO1AN1293EJ0100 Rev 1 00 Page 3 of 14 Apr 1 2014 RENESAS RX630 Group Reducing Power Consumption 2 Controlling Clocks to Reduce Power Consumption 2 1 Operating and Stopping
22. st siawiianan cctvsnanasebatdaasiestaateaennsdccneessencaideadlvctsbaendserdenudctelsdelcstavadaaueildedeaeveedaaen 11 3 3 Notes on Using Low Power Consumption Modes cccccceceeeeeeeeeeneeeeseeeeeeeseeeeeeseeaeeseeaaeees 12 3 3 1 DMAC and DTC Status When Transitioning to a Low Power Consumption Mode 12 3 3 2 BCLK Output When Using a Low Power Consumption Mode ccsccecceeeeeeeeeeeees 12 3 3 3 Transitioning to a Low Power Consumption Mode During D A Conversion 05 12 3 3 4 Transitioning to a Low Power Consumption Mode During A D Conversion S12AD and AD Modules 12 3 3 5 Transitioning to a Low Power Consumption Mode During Data Transmission Reception SCI 12 4 Other Processing seesseecsrresrrrrerersreserrnertinnantinaaanurradenaan ee AAAAAAAAAAAAANAAAAAAAERAAAA AEE esse ANNARA AAAA E EARRAN 13 4 1 Handling of Unused Pins cersreccieniccnienren iien EEE E EEEE 13 S Reference D cumens narsi snie a EA E ee 14 R01AN1293EJ0100 Rev 1 00 Page 2 of 14 Apr 1 2014 RENESAS RX630 Group Reducing Power Consumption 1 Using the Module Stop Function to Reduce Power Consumption The RX630 Group has a module stop function that stops the supply of clocks to peripheral modules Power consumption can be reduced by putting peripheral modules that are not used in the module stop state 1 1 Peripheral Modules That Support the Module Stop Function The module stop can be set with module stop control
23. that the change will not lead to problems The characteristics of an MPU or MCU in the same group but having a different part number may differ in terms of the internal memory capacity layout pattern and other factors which can affect the ranges of electrical characteristics such as characteristic values operating margins immunity to noise and amount of radiated noise When changing to a product with a different part number implement a system evaluation test for the given product Notice 1 Descriptions of circuits software and other related information in this document are provided only to illustrate the operation of semiconductor products and application examples You are fully responsible for the incorporation of these circuits software and information in the design of your equipment Renesas Electronics assumes no responsibility for any losses incurred by you or third parties arising from the use of these circuits software or information 2 Renesas Electronics has used reasonable care in preparing the information included in this document but Renesas Electronics does not warrant that such information is error free Renesas Electronics assumes no liability whatsoever for any damages incurred by you resulting from errors in or omissions from the information included herein 3 Renesas Electronics does not assume any liability for infringement of patents copyrights or other intellectual property rights of third parties by o
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25. ule clock stop mode Disable interrupts PSW I bit 0 Enable writing PRCR register PRC1 bit 1 Enable all module clock stop mode MSTPCRA register FFFF FF C F Fh Stop all modules MSTPCRB register FFFF FFFFh MSTPCRC register MSTP 31 16 bits FFFFh Set the interrupt to determine the source for exit Disable writing PRCR register PRC1 bit 0 Read I O registers Confirm that the value just written to the register has been written Execute the WAIT instruction All module clock stop mode Processing after exiting all module clock stop mode Figure 3 2 Procedure to Enter All Module Clock Stop Mode RO1AN1293EJ0100 Rev 1 00 Page 6 of 14 Apr 1 2014 RENESAS RX630 Group Reducing Power Consumption 3 1 3 Software Standby Mode If the WAIT instruction is executed while the SBYCR SSBY bit is set to 1 and the DPSBYCR DPSBY bit is set to 0 the MCU enters software standby mode Table 3 4 lists the Operating Status of Various Functions While the MCU is in Software Standby Mode Table 3 4 Operating Status of Various Functions While the MCU is in Software Standby Mode Main clock oscillator sub clock oscillator WDT dedicated on chip oscillator IWDT Operating RTC LVD Power on reset circuit CPU HOCO LOCO PLL RAMO data retained RAM1 data retained Stopped Flash memory Peripheral modules except those listed in the Operating row above Bus controller I O ports RO1AN1293EJ0100 Rev 1 00 Page 7 of 14 A
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