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MCP23009

8-Bit I/O Expander with Open-Drain Outputs

Microchip Technology 

MCP23009/MCP23S09

1.6.5 INTERRUPT CONTROL REGISTER

The INTCON register controls how the associated pin

value is compared for the Interrupt-on-Change feature.

If a bit is set, the corresponding I/O pin is compared

against the associated bit in the DEFVAL register. If a

bit value is clear, the corresponding I/O pin is compared

against the previous value.

REGISTER 1-5: INTCON – INTERRUPT-ON-CHANGE CONTROL REGISTER

R/W-0

IOC7

bit 7

R/W-0

IOC6

R/W-0

IOC5

R/W-0

IOC4

R/W-0

IOC3

R/W-0

IOC2

R/W-0

IOC1

R/W-0

IOC0

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-0

IOC<7:0>: Controls how the associated pin value is compared for Interrupt-on-Change <7:0>.

1 = Pin value is compared against the associated bit in the DEFVAL register

0 = Pin value is compared against the previous pin value

Refer to the DEFVAL and GPINTEN registers.

DS20002121C-page 20

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