APOLLO user manual
Issue G
118
LCD control bits data register
The LCD control bits correspond with those used on most standard LCD character
displays and have the following.
RS – Register Select (Command or Data)
IOW – IO Read/Write
ENABLE – Data enable signal
IO address Bit Description
7 Reserved
6 Reserved
5 Reserved
4 RS
3 IOW
2 ENABLE
1 Reserved
Base address + 50h
0 Reserved
GPIO1 and GPIO2 registers
GPIO1 and GPIO2 are standalone GPIO that are not used by the LCD interface; the data
direction register description describes the configuration of the GPIO.
IO address Bit Description
7 Reserved
6 Reserved
5 Reserved
4 GPIO2
3 Reserved
2 Reserved
1 GPIO1
Base address + 4Dh
0 Reserved
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