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LM8323 Datasheet(PDF) 11 Page - Texas Instruments

No. de pieza LM8323
Descripción Electrónicos  LM8323 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host Interface
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LM8323 Datasheet(HTML) 11 Page - Texas Instruments

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background image
No
Yes
Is ERROR
bit set?
No
Yes
Is KEYPAD
bit set?
Read keypad events.
READ_FIFO
No
Yes
Is ROTATOR
bit set?
Read rotation steps.
READ_ROTATOR
No
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
No
Is NOINIT
bit set?
Yes
No
Are NOINIT,ERROR,
and COMMAND
bits clear?
Yes
Check interrupt code.
READ_INT
No
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
Copyright © 2010–2013, Texas Instruments Incorporated
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