MANO110 Series Mini ITX Board U
ser’s Manual
Digital I/O
63
Configure GPIO pin direction as 4 inputs and 4 outputs
outb(0xFF,SMB ICH_SMBUS_HOST_STAT);
// Clear host status
outb(PCA9554SlaveAddr, SMB ICH_SMBUS_HOST_ADDR);
// Set slave address
outb(0x03, SMB ICH_SMBUS_HOST_CMD);
// Configuration register for PCA9554
outb(0xF0, SMB ICH_SMBUS_HOST_DATA_0);
//
outb(0x48, SMB ICH_SMBUS_HOST_CTRL);
// Trigger SMBus Byte operation
Configure GPIO output pin to high
outb(0xFF,SMB ICH_SMBUS_HOST_STAT);
// Clear host status
outb(PCA9554SlaveAddr, SMB ICH_SMBUS_HOST_ADDR);
// Set slave address
outb(0x01, SMB ICH_SMBUS_HOST_CMD);
// Output register for PCA9554
outb(0x0F, SMB ICH_SMBUS_HOST_DATA_0);
outb(0x48, SMB ICH_SMBUS _HOST_CTRL);
// Trigger SMBus Byte operation
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