Allwinner A20 - Keypad Interface Special Requirement

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 806 / 812
6.17.3.6. KEYPAD INPUT DATA REGISTER 1
Offset: 0x14
Register Name: KP_IN1
Default Value: 0xffff_ffff
Bit
Read/Write
Default
Description
[8i+7:8i]
(i=0~3)
R/W
0xff
COL_STA1
Keypad row input byte for column n scan (n from 4 to 7)
6.17.4. Keypad Interface Special Requirement
6.17.4.1. KEYPAD INTERFACE PIN LIST
Port Name
Width
Direction
Description
KP_OUT
8
OUT
KP_IN
8
IN