LM8323 datasheet(11/47 Pages) TI1

11 / 47 page

Yes

Is ERROR

bit set?

Yes

Is KEYPAD

bit set?

Read keypad events.

READ_FIFO

Yes

Is ROTATOR

bit set?

Read rotation steps.

READ_ROTATOR

Yes

Is a PWMxEND

bit set?

Service PWM channel.

Check error code.

READ_ERROR

Initialize configuration.

WRITE_CFG

Configure clocks.

WRITE_CLOCK

Specify keypad size.

SET_KEY_SIZE

Configure GPIO pins.

WRITE_PORT_STATE

WRITE_PORT_SEL

Check interrupt code.

READ_INT

Initialize keypad scan timing.

SET_ACTIVE

SET_DEBOUNCE

Is NOINIT

bit set?

Yes

Are NOINIT,ERROR,

and COMMAND

bits clear?

Yes

Check interrupt code.

READ_INT

Yes

Send any command.

READ_PORT_STATE

PWM_WRITE, etc.

Host Initialization

Is IRQ low?

Service error condition.

If the error code reports a

FIFOOVR or KEYOVR error,

then the FIFO buffer must be

unloaded to clear the FIFO.

If this is not done, the LM8323

will not store any new events in

the FIFO. Any data unloaded

from the FIFO after the error

interrupt should be ignored.

LM8323

www.ti.com

SNLS273A – JULY 2010 – REVISED MARCH 2013

Figure 5. IRQ Reset Timing

After sending the WRITE_CFG command, the host must send a series of commands to configure the LM8323,

as shown in Figure 6. (See left hand side.)

This Flow - diagram illustrates also the basic host communication steps which the host must execute upon an

IRQ request received from the LM8323 during operation. Such requests will be made from the LM8323 as a

result of key pressed events, the detection of an error, the termination of a PWM cycle and others.

Figure 6. Host-Side LM8323 Initialization

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