MCP23008 데이터 시트보기 (PDF) - Unspecified

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MCP23008

8-Bit I/O Expander with Serial Interface

Unspecified 

MCP23008/MCP23S08

1.4.1

ADDRESSING I2C DEVICES

(MCP23008)

The MCP23008 is a slave I2C device that supports 7-bit

slave addressing, with the read/write bit filling out the

control byte. The slave address contains four fixed bits

and three user-defined hardware address bits (pins A2,

A1 and A0). Figure 1-2 shows the control byte format.

1.4.2

ADDRESSING SPI DEVICES

(MCP23S08)

The MCP23S08 is a slave SPI device. The slave

address contains five fixed bits and two user-defined

hardware address bits (pins A1 and A0), with the

read/write bit filling out the control byte. Figure 1-3

shows the control byte format.

FIGURE 1-2:

I2C™ CONTROL BYTE

FORMAT

Control Byte

S 0 1 0 0 A2 A1 A0 R/W ACK

Slave Address

Start

bit

R/W = 0 = write

R/W = 1 = read

R/W bit

ACK bit

FIGURE 1-3:

SPI™ CONTROL BYTE

FORMAT

CS

Control Byte

0 1 0 0 0 A1 A0 R/W

Slave Address

R/W bit

R/W = 0 = write

R/W = 1 = read

FIGURE 1-4:

I2C™ ADDRESSING REGISTERS

S 0 1 0 0 A2 A1 A0 0 ACK A7 A6 A5 A4 A3 A2 A1 A0 ACK

Device Opcode

R/W = 0

Register Address

The ACKs are provided by the MCP23008.

FIGURE 1-5:

SPI™ ADDRESSING REGISTERS

CS

0 1 0 0 0 A1 A0 R/W

Device Opcode

A7 A6 A5 A4 A3 A2 A1 A0

Register Address

DS21919B-page 6

© 2005 Microchip Technology Inc.

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