MCP23009 Microchip Technology Inc., MCP23009 Datasheet - Page 20

• Manufacturer Part Number: MCP23009
• Description: 8-bit I/o Expander With Open-drain Outputs
• Manufacturer: Microchip Technology Inc.

MCP23009/MCP23S09
1.6.5
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 1-6:
DS22121A-page 20
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-0
R/W-0
IOC7
INTERRUPT CONTROL REGISTER
IOC7:IOC0: Controls how the associated pin value is compared for interrupt-on-change <7:0>.
1 = Pin value is compared against the associated bit is DEFVAL register
0 = Pin value is compared against the previous pin value.
Refer to DEFVAL and GPINTEN.
R/W-0
IOC6
INTCON – INTERRUPT-ON-CHANGE CONTROL REGISTER
W = Writable bit
‘1’ = Bit is set
R/W-0
IOC5
R/W-0
IOC4
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-0
IOC3
R/W-0
IOC2
© 2008 Microchip Technology Inc.
x = Bit is unknown
R/W-0
IOC1
R/W-0
IOC0
bit 0