MSI MS-919-98F1-103, Manual, Page: 55 / 58

A-3
WDT & GPIO MS-98F1
GPIO Sample Code

GPI 0 ~ GPI 3
GPI 0 GPI 1 GPI 2 GPI 3
IO Address
(SMbus Address)
F040h F040h F040h F040h
Slave Address 9Ch 9Ch 9Ch 9Ch
SIO GPIO Register 20h 20h 20h 20h
Bit 4 5 6 7
Sample code #1

GPO 0 ~ GPO 3
GPO 0 GPO 1 GPO 2 GPO 3
IO Address
(SMbus Address)
F040h F040h F040h F040h
Slave Address 9Ch 9Ch 9Ch 9Ch
SIO GPIO Register 20h 20h 20h 20h
Bit 0 1 2 3
Sample code #2
SMBUS_ADDRESS equ F040h
SMBUS_ADDRESS02 equ SMBUS_A02h ;set command type and start the operation
SMBUS_ADDRESS03 equ SMBUS_03h ;set register index
SMBUS_ADDRESS04 equ SMBUS_04h ;set slave address
SMBUS_ADDRESS05 equ SMBUS_05h ;set register value
SLAVE_ADDRESS equ 09Ch
SIO_GPIO2x_Status equ 020h
SIO_GPIO2x_Data equ 021h
GPI_0 equ 00000000b
GPO_0 equ 00000001b
------------------------------------------------------------------------------
Sample Code:
#1 : Set GPI 0 status
mov ax, SLAVE_ADDRESS SIO_GPIO2x_Status
mov cl, GPI_0 ;bit1=GPI 0 status
push ax
mov dx, SMBUS_ADDRESS
mov al,1eh ;clear(bit1~4) status
out dx,al
pop ax