Allwinner A20 - Page 805

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 805 / 812
Offset: 0x08
Register Name: KP_INT_CFG
Default Value: 0x0000_0000
Bit
Read/Write
Default
Description
1: Enable
0
R/W
0
FEDGE_INT_EN
Keypad input falling edge (key press) interrupt enable
0: Disable
1: Enable
6.17.3.4. KEYPAD INTERRUPT STATUS REGISTER
Offset: 0x0C
Register Name: KP_INT_STA
Default Value: 0x0000_0000
Bit
Read/Write
Default
Description
31:2
/
/
/
1
R/W
0
REDGE_FLAG
Keypad input rising edge (key release) interrupt status
When it is ‘1’, ther key released interrupt occurred.
The interrupt is cleared when write ‘1’.
0
R/W
0
FEDGE_FLAG
Keypad input falling edge (key press) interrupt status
When it is ‘1’, the corresponding pressed interrupt occurred.
The interrupt is cleared when write ‘1’.
6.17.3.5. KEYPAD INPUT DATA REGISTER 0
Offset: 0x10
Register Name: KP_IN0
Default Value: 0xffff_ffff
Bit
Read/Write
Default
Description
[8i+7:8i
]
(i=0~3)
R/W
0xff
COL_STA0
Keypad row input byte for column n scan (n from 0 to 3)