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

1.6.11 OUTPUT LATCH REGISTER (OLAT)

The OLAT register provides access to the output

latches. A read from this register results in a read of the

OLAT and not the port itself. A write to this register

modifies the output latches that modify the pins

configured as outputs.

REGISTER 1-11: OLAT – OUTPUT LATCH REGISTER 0 (ADDR 0x0A)

R/W-0

OL7

bit 7

R/W-0

OL6

R/W-0

OL5

R/W-0

OL4

R/W-0

OL3

R/W-0

OL2

R/W-0

OL1

R/W-0

OL0

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

OL7:OL0: These bits reflect the logic level on the output latch <7:0>

1 = Logic-high.

0 = Logic-low.

DS21919D-page 20

© 2007 Microchip Technology Inc.

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