ZKit-51 Keypad
Contents
1.2. n gt n u a o e N 4 Connectivity The Keypad can be connected to the ZKit 51 Motherboard s PORT P0 P4 header using FRC 20 connector The connection details are given below Zilogic Systems Page 1 ZKit 51 Keypad User Manual Rev 1 0 Figure 1 2 Signal connection diagram COLO COLI COL2 COL3 po 7 LL Icons ZKit 51 ZKit 51 Keypad Motherboard Table 1 1 Signal connection table Pin Noo 9 11 13 15 17 19 Motherboard Keypad Pin Motherboard Keypad VCC 2 PO O ADO COLO PO 1 AD1 COL1 4 PO 2 AD2 COL2 P0 3 AD3 COL3 6 PO 4 AD4 ROWO PO 5 AD5 ROW1 8 PO 6 AD6 ROW2 PO 7 AD7 ROW3 10 P4 0 SCK SCL P4 1 MISO SDA 12 P4 2 MOSI P4 3 SS 14 SCL SDA 16 WR P3 6 RD P3 7 18 ALE INT1 P3 3 20 GND 5 Scanning Algorithm The micro controller detects keystrokes using a scanning algorithm Scanning can be done column wise or row wise The row wise scanning algorithm is described below a 0 0 O Q Configure column pins for input Configure row pins for output Drive 1 in all rows Initialize row_counter to 0 Drive row indicated by the row_counter to 0 Read the column signal status If any of the columns is low a button at that row and column position has been pressed Return the position of the button Increment row_counter If row_counter less than 4 goto step e Return no key press Zilogic Systems Page 2
3. ZKit 51 Keypad User Manual 1 0 June 2009 E Zoic SYSTEMS ZKit 51 Keypad User Manual Rev 1 0 This work is licensed under the Creative Commons Attribution Share Alike 2 5 India License To view a copy of this license visit http creativecommons org licenses by sa 2 5 in or send a letter to Creative Commons 171 Second Street Suite 300 San Francisco California 94105 USA ZKit 51 Keypad User Manual Rev 1 0 Table of Contents 1 ZAI Keypad sitio ii criba 1 1 WSR VIO WY ia aay occa a dio 1 2 FORUS OPA OPA tetas seuvicann sdb eaves seadiebentbuedent savas A 1 9 Locating Components cusco 1 4 COMOCIVIY as pren a mena un a A EE AE Dacia 1 5 Scanning AIQOMUUM stores 2 Zilogic Systems Page iii ZKit 51 Keypad User Manual Rev 1 0 Chapter 1 ZKit 51 Keypad 1 Overview The ZKit 51 Keypad provides extended input capabilities to the ZKit 51 motherboard with a 16 key 4x4 row matrix The Keypad can be used to input numbers and special characters Enter Esc Up Arrowand Down Arrow The micro controller detects keystrokes using a scanning algorithm described in Section 5 Scanning Algorithm 2 Features e Low profile push button keys e 16 Push Button Keys e Arranged in 4x4 matrix 3 Locating Components The location of the components on the board are indicated in the following diagram Figure 1 1 Front View FRC 20 x N o o gt lt a lt a gt ty E ZK51 PORT n E a
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