MCP23008-E/P 데이터 시트보기 (PDF) - Microchip Technology

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MCP23008-E/P

8-Bit I/O Expander with Serial Interface

Microchip Technology 

MCP23008/MCP23S08

1.6.1 I/O DIRECTION (IODIR) REGISTER

Controls the direction of the data I/O.

When a bit is set, the corresponding pin becomes an

input. When a bit is clear, the corresponding pin

becomes an output.

REGISTER 1-1: IODIR – I/O DIRECTION REGISTER (ADDR 0x00)

R/W-1

IO7

bit 7

R/W-1

IO6

R/W-1

IO5

R/W-1

IO4

R/W-1

IO3

R/W-1

IO2

R/W-1

IO1

R/W-1

IO0

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

IO7:IO0: These bits control the direction of data I/O <7:0>

1 = Pin is configured as an input.

0 = Pin is configured as an output.

DS21919D-page 10

© 2007 Microchip Technology Inc.

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