LM8322 datasheet(32/42 Pages) NSC

32 / 42 page

17.7 WRITE_PORT_STATE COMMAND

The WRITE_PORT_STATE command consists of a com-

mand byte (0x86) and two data bytes from the host. For

general-purpose I/O ports configured as inputs, the data

bytes select whether the inputs are high-impedance (0) or

have a weak pullup (1). For ports configured as outputs, the

data bytes control the state driven on the output. The first data

byte controls ports GPIO_15 through GPIO_08, and the sec-

ond byte controls ports GPIO_07 through GPIO_00.

Bit

Value

Description

GPIO_xx

If the GPIO port pin is an input, pullup/pulldown device is disabled. If the GPIO port

pin is an output, it is driven low.

If the GPIO port pin is an input, pullup/pulldown device is enabled. If the GPIO port

pin is an output, it is driven high.

17.8 READ_PORT_SEL COMMAND

The READ_PORT_SEL command consists of a command

byte (0x87) from the host and two data bytes from the

LM8322. The data bytes indicate the direction configured for

the corresponding ports, either input (0) or output (1). The first

data byte controls ports GPIO_15 through GPIO_08, and the

second byte controls ports GPIO_07 through GPIO_00.

Bit

Value

Description

GPIO_xx

GPIO port pin is an input.

GPIO port pin is an output.

LM8322 Datasheet(PDF) 32 Page - National Semiconductor (TI)