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Detailed hardware description
Issue G
117
Registers V2Ix board
Data direction register
IO address
Bit
Description
7
Output type select
1 = Open Drain
0 = Push Pull
6:4 Reserved
3:2
00 = GPIO
Others = reserved
1
Polarity
1 = Invert
0 = No invert
D0:
Base a 23h
D1:
Base a 24h
D2:
Base a 25h
D3:
Base a 26h
D4:
Base a 27h
D5:
Base a 29h
D6:
Base a 2Ah
D7:
Base a 2Bh
GPIO1: Base a 34h
GPIO2: Base a 37h
ENABLE: Base a 54h
IOW:
Base a 55h
RS:
Base a 56h
0
In/out
In = 1
Out = 0
GPIO0/GPIO1 are only available as open drain outputs when in output mode.
LCD data register
IO address
Bit
Description
7
D7 Data bit
6
D6 Data bit
5
D5 Data bit
4
D4 Data bit
3
D3 Data bit
2
D2 Data bit
1
D1 Data bit
Base a 4Bh
0
D0 Data bit