LM8323 datasheet(34/47 Pages) TI1

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LM8323

SNLS273A – JULY 2010 – REVISED MARCH 2013

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WRITE_PORT_SEL COMMAND

The WRITE_PORT_SEL command consists of a command byte (0x85) and two data bytes from the host. The

data bytes configure the corresponding general-purpose I/O ports as inputs (0) or outputs (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 port pin is an input.

GPIO_xx

GPIO port pin is an output.

The GPIO_09 port pin can only be configured as an input with weak pullup/pulldown device.

WRITE_PORT_STATE COMMAND

The WRITE_PORT_STATE command consists of a command 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 second byte controls ports GPIO_07

through GPIO_00.

Bit

Value

Description

If the GPIO port pin is an input, pullup device is disabled. If the GPIO port pin is an output, it is

driven low.

GPIO_xx

If the GPIO port pin is an input, pullup device is enabled. If the GPIO port pin is an output, it is

driven high.

READ_PORT_SEL COMMAND

The READ_PORT_SEL command consists of a command byte (0x87) from the host and two data bytes from the

LM8323. 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 port pin is an input.

GPIO_xx

GPIO port pin is an output.

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LM8323 Datasheet(PDF) 34 Page - Texas Instruments