MCP23018 Просмотр технического описания (PDF) - Microchip Technology

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MCP23018

16-Bit I/O Expander with Open-Drain Outputs

Microchip Technology 

MCP23018/MCP23S18

1.5 GPIO Port

The GPIO module is a general purpose 16-bit wide

bidirectional port which is functionally split into two (2)

8-bit wide ports.

The outputs are open-drain.

The GPIO module contains the data ports (GPIOn),

internal pull up resistors and the Output Latches

(OLATn).

The pull up resistors are individually configured and

can be enabled when the pin is cofigured as an input or

output.

Reading the GPIOn register reads the value on the

port. Reading the OLATn register only reads the

latches, not the actual value on the port.

Writing to the GPIOn register actually causes a write to

the latches (OLATn). Writing to the OLATn register

forces the associated output drivers to drive to the level

in OLATn. Pins configured as inputs turn off the associ-

ated output driver and put it in high-impedance.

TABLE 1-2: SUMMARY OF REGISTERS ASSOCIATED WITH THE GPIO PORTS (BANK = 1)

Register Address

Name

(hex)

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

POR/RST

value

IODIRA

IPOLA

GPINTENA

GPPUA

GPIOA

OLATA

IODIRB

IPOLB

GPINTENB

GPPUB

GPIOB

OLATB

00

IO7

IO6

IO5

IO4

IO3

IO2

IO1

IO0 1111 1111

01

IP7

IP6

IP5

IP4

IP3

IP2

IP1

IP0 0000 0000

02

GPINT7 GPINT6 GPINT5 GPINT4 GPINT3 GPINT2 GPINT1 GPINT0 0000 0000

06

PU7

PU6

PU5

PU4

PU3

PU2

PU1

PU0 0000 0000

09

GP7

GP6

GP5

GP4

GP3

GP2

GP1

GP0 0000 0000

0A

OL7

OL6

OL5

OL4

OL3

OL2

OL1

OL0 0000 0000

10

IO7

IO6

IO5

IO4

IO3

IO2

IO1

IO0 1111 1111

11

IP7

IP6

IP5

IP4

IP3

IP2

IP1

IP0 0000 0000

12

GPINT7 GPINT6 GPINT5 GPINT4 GPINT3 GPINT2 GPINT1 GPINT0 0000 0000

16

PU7

PU6

PU5

PU4

PU3

PU2

PU1

PU0 0000 0000

19

GP7

GP6

GP5

GP4

GP3

GP2

GP1

GP0 0000 0000

1A

OL7

OL6

OL5

OL4

OL3

OL2

OL1

OL0 0000 0000

TABLE 1-3: SUMMARY OF REGISTERS ASSOCIATED WITH THE GPIO PORTS (BANK = 0)

Register

Name

Address

(hex)

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

POR/RST

value

IODIRA

IODIRB

IPOLA

IPOLB

GPINTENA

GPINTENB

GPPUA

GPPUB

GPIOA

GPIOB

OLATA

OLATB

00

IO7

IO6

IO5

IO4

IO3

IO2

IO1

IO0 1111 1111

01

IO7

IO6

IO5

IO4

IO3

IO2

IO1

IO0 1111 1111

02

IP7

IP6

IP5

IP4

IP3

IP2

IP1

IP0 0000 0000

03

IP7

IP6

IP5

IP4

IP3

IP2

IP1

IP0 0000 0000

04

GPINT7 GPINT6 GPINT5 GPINT4 GPINT3 GPINT2 GPINT1 GPINT0 0000 0000

05

GPINT7 GPINT6 GPINT5 GPINT4 GPINT3 GPINT2 GPINT1 GPINT0 0000 0000

0C

PU7

PU6

PU5

PU4

PU3

PU2

PU1

PU0 0000 0000

0D

PU7

PU6

PU5

PU4

PU3

PU2

PU1

PU0 0000 0000

12

GP7

GP6

GP5

GP4

GP3

GP2

GP1

GP0 0000 0000

13

GP7

GP6

GP5

GP4

GP3

GP2

GP1

GP0 0000 0000

14

OL7

OL6

OL5

OL4

OL3

OL2

OL1

OL0 0000 0000

15

OL7

OL6

OL5

OL4

OL3

OL2

OL1

OL0 0000 0000

© 2008 Microchip Technology Inc.

DS22103A-page 15

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