MCP23008 查看數據表（PDF） - Unspecified

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MCP23008

8-Bit I/O Expander with Serial Interface

Unspecified 

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 R/W-1 R/W-1 R/W-1

R/W-1

IO7

IO6

IO5

IO4

IO3

bit 7

R/W-1

IO2

R/W-1

IO1

R/W-1

IO0

bit 0

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.

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

DS21919B-page 8

© 2005 Microchip Technology Inc.

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