MCP23016 查看數據表（PDF） - Microchip Technology
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MCP23016 Datasheet PDF : 38 Pages
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MCP23016
1.7.4 I/O DIRECTION REGISTERS
Two registers control the direction of data I/O:
• IODIR0 (controls GP0)
• IODIR1 (controls GP1)
When a bit in these registers is set, the corresponding
pin becomes an input. Otherwise, it becomes an
output. At Power-on Reset, the device ports are
configured as inputs.
REGISTER 1-7: IODIR0 - I/O DIRECTION REGISTER 0
R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
IOD0.7 IOD0.6 IOD0.5 IOD0.4 IOD0.3
bit 7
R/W-1
IOD0.2
R/W-1
IOD0.1
R/W-1
IOD0.0
bit 0
bit 7-0
IOD0.0:IO0.7: Controls the direction of data I/O
1 = Input
0 = 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
REGISTER 1-8: IODIR1 - I/O DIRECTION REGISTER 1
R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
IOD1.7 IOD1.6 IOD1.5 IOD1.4 IOD1.3
bit 7
R/W-1
IOD1.2
R/W-1
IOD1.1
R/W-1
IOD1.0
bit 0
bit 7-0
IOD1.0:IO1.7: Controls the direction of data I/O
1 = Input
0 = 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
© 2007 Microchip Technology Inc.
DS20090C-page 9
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