Allwinner A20 - Page 292

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 292 / 812
1.19.4.76. PI DATA REGISTER
Offset: 0x130
Register Name: PI_DAT
Default Value: 0x0000_0000
Bit
Read/Write
Default
Description
31:22
/
/
/
21:0
R/W
0
PI_DAT
If the port is configured as input, the corresponding bit is the
pin state. If the port is configured as output, the pin state is the
same as the corresponding bit. The read bit value is the value
setup by software. If the port is configured as functional pin,
the undefined value will be read.
1.19.4.77. PI MULTI-DRIVING REGISTER 0
Offset: 0x134
Register Name: PI_DRV0
Default Value: 0x5555_5555
Bit
Read/Write
Default
Description
[2i+1:2i]
(i=0~15)
R/W
0x1
PI_DRV
PI[n] Multi-Driving Select (n = 0~15)
00: Level 0 01: Level 1
10: Level 2 11: Level 3
1.19.4.78. PI MULTI-DRIVING REGISTER 1
Offset: 0x138
Register Name: PI_DRV1
Default Value: 0x0000_0555
Bit
Read/Write
Default
Description
31:12
/
/
Reserved
[2i+1:2i]
(i=0~5)
R/W
0x1
PI_DRV
PI[n] Multi-Driving Select (n = 16~21)
00: Level 0 01: Level 1