LM8322 datasheet(33/42 Pages) NSC

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17.9 READ_PORT_STATE COMMAND

The READ_PORT_STATE command consists of a command

byte (0x88) from the host and two data bytes from the

LM8322. The data bytes indicate the states on the corre-

sponding ports. The first data byte controls ports GPIO_15

through GPIO_08, and the second byte controls ports

GPIO_07 through GPIO_00.

IO_

Bit

Value

Description

GPIO_xx

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

output, it is driven low.

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

output, it is driven high.

17.10 READ_FIFO COMMAND

The READ_FIFO command consists of a command byte

(0x89) sent from the host and a variable number of data bytes

received from the LM8322. The LM8322 will provide data until

the FIFO is empty. The last data byte is indicated by its value

(0x00) and a negative acknowledgement (NACK) on the

ACCESS.bus interface. The data bytes correspond to key-

press and key-release events, as described in Table 5.

FIFODATA

0x00

Field

Value

Description

FIFODATA

0xxxxxxx

Key-release event.

1xxxxxxx

Key-press event.

17.11 RPT_READ_FIFO COMMAND

The RPT_READ_FIFO command consists of a command

byte (0x8A) and from the host and a variable number of data

bytes from the LM8322. This command provides the same

data as a previous READ_FIFO command, but without ad-

vancing the FIFO pointer. It may be used to recover from an

error encountered during a READ_FIFO command.

FIFODATA

0x00

Field

Value

Description

FIFODATA

0xxxxxxx

Key-release event.

1xxxxxxx

Key-press event.

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