MCP23017-ESLASHML datasheet(23/42 Pages) MICROCHIP

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 2005-2016 Microchip Technology Inc.

DS20001952C-page 23

MCP23017/MCP23S17

3.5.9

INTERRUPT CAPTURED REGISTER

The INTCAP register captures the GPIO port value at

the time the interrupt occurred. The register is

read-only and is updated only when an interrupt

occurs. The register remains unchanged until the

interrupt is cleared via a read of INTCAP or GPIO.

3.5.10

PORT REGISTER

The GPIO register reflects the value on the port.

Reading from this register reads the port. Writing to this

INTCAP: INTERRUPT CAPTURED VALUE FOR PORT REGISTER (ADDR 0x08)

R-x

ICP7

ICP6

ICP5

ICP4

ICP3

ICP2

ICP1

ICP0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-0

ICP<7:0>: Reflects the logic level on the port pins at the time of interrupt due to pin change <7:0>

= Logic-high

= Logic-low

GPIO: GENERAL PURPOSE I/O PORT REGISTER (ADDR 0x09)

R/W-0

GP7

GP6

GP5

GP4

GP3

GP2

GP1

GP0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-0

GP<7:0>: Reflects the logic level on the pins <7:0>

= Logic-high

= Logic-low

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