MCP23008 查看數據表（PDF） - Microchip Technology

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MCP23008

8-Bit I/O Expander with Serial Interface

Microchip Technology 

MCP23008/MCP23S08

1.6.9

INTERRUPT CAPTURE (INTCAP)

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 will remain unchanged until the interrupt is

cleared via a read of INTCAP or GPIO.

REGISTER 1-9: INTCAP – INTERRUPT CAPTURED VALUE FOR PORT REGISTER (ADDR 0x08)

R-x

ICP7

bit 7

R-x

ICP6

R-x

ICP5

R-x

ICP4

R-x

ICP3

R-x

ICP2

R-x

ICP1

R-x

ICP0

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

ICP7:ICP0: These bits reflect the logic level on the port pins at the time of interrupt due to pin change

<7:0>

1 = Logic-high.

0 = Logic-low.

DS21919D-page 18

© 2007 Microchip Technology Inc.

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