MCP23009 Microchip Technology Inc., MCP23009 Datasheet - Page 26

• Manufacturer Part Number: MCP23009
• Description: 8-bit I/o Expander With Open-drain Outputs
• Manufacturer: Microchip Technology Inc.

MCP23009/MCP23S09
1.6.11
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 modifies the pins
configured as outputs.
REGISTER 1-12:
DS22121A-page 26
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-0
R/W-0
OL7
OUTPUT LATCH REGISTER (OLAT)
OL7:OL0: Reflects the logic level on the output latch <7:0>.
1 = Logic-high.
0 = Logic-low.
R/W-0
OL6
OLAT – OUTPUT LATCH REGISTER 0
W = Writable bit
‘1’ = Bit is set
R/W-0
OL5
R/W-0
OL4
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-0
OL3
R/W-0
OL2
© 2008 Microchip Technology Inc.
x = Bit is unknown
R/W-0
OL1
R/W-0
OL0
bit 0