lm8333ggr8x National Semiconductor Corporation, lm8333ggr8x Datasheet - Page 12

• Manufacturer Part Number: lm8333ggr8x
• Description: Mobile I/o Companion Supporting Key-scan, I/o Expansion, Pwm, And Access.bus Host Interface
• Manufacturer: National Semiconductor Corporation

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10.3 STATUS CODES
The host can use the READ_STAT command (0xE0) to read
the status code, for example to synchronize after an error.
10.4 INTERRUPT PROCESSING
Unexpected states encountered during run-time, for example
overrun of the FIFO buffer, are reported as errors. When the
host receives an interrupt from the LM8333, it uses a
READ_INT command to read the interrupt code. If the code
has a set ERROR bit, the host then uses a READ_ERROR
command to read the error code, as shown in Figure 11.
Bit
FIFOOVR
NOINT
KEYOVR
CMDUNK
CMDOVR
Wake Up Interrupt
Status
NoAck
Reset
Ack
Description
Key event occurred while the FIFO was full.
Interrupt deasserted before it could be serviced.
More than two keys were pressed simultaneously.
Not a valid command.
Command received before it could be accepted, e.g. after wake-up.
0000 0000
0000 0010
0000 0110
0001 0101
Code
TABLE 8. Status Codes
12
Default after reset.
Wake-up caused by external interrupt.
Last host command was successful.
Last host command was not successful.
FIGURE 11. Interrupt Processing
Description
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