MCP23016-I/P Microchip Technology, MCP23016-I/P Datasheet - Page 9

• Manufacturer Part Number: MCP23016-I/P
• Description: 16-Bit I2C I/O Expander
• Manufacturer: Microchip Technology

1.7.4
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:
REGISTER 1-8:
bit 7-0
bit 7-0
2003 Microchip Technology Inc.
I/O DIRECTION REGISTERS
IOD0.0:IO0.7:
1 = Input
0 = Output
IOD1.0:IO1.7:
1 = Input
0 = Output
Legend:
R = Readable bit
- n = Value at POR
Legend:
R = Readable bit
- n = Value at POR
IOD0.7
IOD1.7
R/W-1
R/W-1
bit 7
bit 7
IODIR0 - I/O DIRECTION REGISTER 0
IODIR1 - I/O DIRECTION REGISTER 1
IOD0.6
IOD1.6
R/W-1
R/W-1
Controls the direction of data I/O
Controls the direction of data I/O
IOD0.5
IOD1.5
R/W-1
R/W-1
W = Writable bit
‘1’ = Bit is set
W = Writable bit
‘1’ = Bit is set
IOD0.4
IOD1.4
R/W-1
R/W-1
IOD0.3
IOD1.3
R/W-1
R/W-1
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
IOD0.2
IOD1.2
R/W-1
R/W-1
x = Bit is unknown
x = Bit is unknown
IOD0.1
IOD1.1
R/W-1
R/W-1
MCP23016
IOD0.0
IOD1.0
R/W-1
R/W-1
bit 0
bit 0
DS20090B-page 9