MSI 919-98E2-001, Manual

Page: 59 / 60

A-3
WDT & GPIO MS-98E2
GPIO Sample Code

GPI 0 ~ GPI 3
GPI 0 GPI 1 GPI 2 GPI 3
IO Address F040h F040h F040h F040h
Slave Address 9Ch 9Ch 9Ch 9Ch
SIO GPIO Register 42h 42h 42h 22h
Bit 0 1 2 3
Sample code #1 #1 #1 #1

GPO 0 ~ GPO 3
GPO 0 GPO 1 GPO 2 GPO 3
IO Address F040h F040h F040h F040h
Slave Address 9Ch 9Ch 9Ch 9Ch
SIO GPIO Register 22h 22h 22h 22h
Bit 4 5 6 7
Sample code #2 #2 #2 #2
SMBUS_BASE_ADDRESS equ F040h ;IO Address
SLAVEADDRESS equ 9Ch ;Slave Address
GPI0_REG equ 42h
GPO0_REG equ 22h
GPO0_Value equ 00010000b
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Sample Code:
#1 : Get GPI 0 status
mov dx, GPI0_REG
in al, dx ;al bit0 = GPI 0 status
#2 : Set GPO 0 status to high
mov dx, GPO0_REG
in al, dx
and al, not GPO0_Value
or al, GPO0_value ;al bit4 = GPO 0 staus
out dx, al