LM8333

www.ti.com

SNLS246K – SEPTEMBER 2006 – REVISED MAY 2013

Figure 12. LM8333 Responds with NACK, Host Retries Command

Interrupts

INTERRUPT CODE

The interrupt code is read and acknowledged with the READ_INT command (0xD0). This command clears the

code and deasserts the IRQ output. Table 6 shows the format of the interrupt code.

Note that when only one of the interrupt-capable pins GEN_IO_0 or GEN_IO_1 is configured as an interrupt

input, bits 1 and 2 are both set when an interrupt occurs. When both GEN_IO_0 and GEN_IO_1 pins are

configured as interrupt inputs, only one bit corresponding to the interrupt source is set when an interrupt occurs.

Table 6. Interrupt Code

7

6

5

4

3

2

1

0

0

0

0

0

ERROR

EX_1

EX_0

KEYPAD

Bit

Description

ERROR

An error condition occurred.

EX_1

A rising or falling edge was detected on GEN_IO_1.

EX_0

A rising or falling edge was detected on GEN_IO_0.

KEYPAD

A key-press or key-release event occurred.

ERROR CODE

If the LM8333 reports an error, the READ_ERROR command (0xF0) is used to read and clear the error code.

Table 7 shows the format of the error code.

Table 7. Error Code

7

6

5

4

3

2

1

0

0

FIFOOVR

0

NOINT

0

KEYOVR

CMDUNK

CMDOVR

Bit

Description

FIFOOVR

Key event occurred while the FIFO was full.

NOINT

Interrupt deasserted before it could be serviced.

KEYOVR

More than two keys were pressed simultaneously.

CMDUNK

Not a valid command.

CMDOVR

Command received before it could be accepted, e.g. after wake-up.

Copyright © 2006–2013, Texas Instruments Incorporated

Submit Documentation Feedback

13

Product Folder Links: LM8333