AXIOMTEK eBOX620-841-FL Series, Руководство пользователя

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eBOX620-841-FL Series U
ser’s Manual
Digital I/O
61
APPENDIX B
DIGITAL I/O
About Digital I/O
The onboard digital I/O has 8 bits (DIO0~7). Each bit can be set to function as input or output
by software programming. In default, all pins are pulled high with +5V level (according to main
power). The BIOS default settings are 3 inputs and 5 outputs where all of these pins are set to
1.
Digital I/O Programming
The following example enables configuration using debug tool.
Start digital I/O programming

Enable configuration:
O 2E 87 ; Un-lock super I/O
O 2E 87

Select logic device:
O 2E 07
O 2F 07

Set multi-function selection:
O 2E 1C
O 2F 1C ; Open GPIO2 and close UART

Set GPIO2 I/O register:
O 2E E8
O 2F 00 ; 00: Programmed to function as output port
; FF: Programmed to function as input port

Set GPIO2 data register:
; Set digital output pins value
O 2E E9
O 2F 00 ; 00: Set digital output to low level
; FF: Set digital output to high level
