MCP23017 データシートの表示（PDF） - Microchip Technology
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MCP23017 Datasheet PDF : 42 Pages
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MCP23017/MCP23S17
TABLE 3-5: CONTROL REGISTER SUMMARY (IOCON.BANK = 0) (CONTINUED)
Register Address
Name
(hex)
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
INTFA
INTFB
INTCAPA
INTCAPB
GPIOA
GPIOB
OLATA
OLATB
0E
INT7
INT6
INT5
INT4
INT3
INT2
INT1
INTO
0F
INT7
INT6
INT5
INT4
INT3
INT2
INT1
INTO
10
ICP7
ICP6
ICP5
ICP4
ICP3
ICP2
ICP1
ICP0
11
ICP7
ICP6
ICP5
ICP4
ICP3
ICP2
ICP1
ICP0
12
GP7
GP6
GP5
GP4
GP3
GP2
GP1
GP0
13
GP7
GP6
GP5
GP4
GP3
GP2
GP1
GP0
14
OL7
OL6
OL5
OL4
OL3
OL2
OL1
OL0
15
OL7
OL6
OL5
OL4
OL3
OL2
OL1
OL0
POR/RST
value
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
3.5.1 I/O DIRECTION 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 3-1: IODIR: I/O DIRECTION REGISTER (ADDR 0x00)
R/W-1
IO7
bit 7
R/W-1
IO6
R/W-1
IO5
R/W-1
IO4
R/W-1
IO3
R/W-1
IO2
R/W-1
IO1
R/W-1
IO0
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
IO<7:0>: Controls the direction of data I/O <7:0>
1 = Pin is configured as an input.
0 = Pin is configured as an output.
3.5.2 INPUT POLARITY REGISTER
This register allows the user to configure the polarity on
the corresponding GPIO port bits.
If a bit is set, the corresponding GPIO register bit will
reflect the inverted value on the pin.
REGISTER 3-2: IPOL: INPUT POLARITY PORT REGISTER (ADDR 0x01)
R/W-0
IP7
bit 7
R/W-0
IP6
R/W-0
IP5
R/W-0
IP4
R/W-0
IP3
R/W-0
IP2
R/W-0
IP1
R/W-0
IP0
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
IP<7:0>: Controls the polarity inversion of the input pins <7:0>
1 = GPIO register bit reflects the opposite logic state of the input pin.
0 = GPIO register bit reflects the same logic state of the input pin.
DS20001952C-page 18
2005-2016 Microchip Technology Inc.
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