MCP23008 查看數據表（PDF） - Unspecified

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MCP23008

8-Bit I/O Expander with Serial Interface

Unspecified 

MCP23008/MCP23S08

FIGURE 1-1:

MCP23008 I2C™ DEVICE PROTOCOL

S - START

SR - RESTART

P - STOP

S OP

w - Write

R - Read

OP - Device opcode

W ADDR

ADDR - Device address

DOUT - Data out from MCP23008

DIN - Data into MCP23008

DIN .... DIN

P

SR OP R DOUT .... DOUT

P

SR OP W DIN .... DIN

P

P

S OP R

DOUT .... DOUT

P

SR OP R DOUT .... DOUT

P

SR OP W ADDR DIN .... DIN

P

P

Byte and Sequential Write

Byte S OP W ADDR

DIN

P

Sequential S OP W ADDR

DIN .... DIN

P

Byte and Sequential Read

Byte S OP R

SR OP R DOUT

P

Sequential S OP R

SR OP R DOUT .... DOUT

P

1.3.3.3 SPI Sequential Write/Read

For sequential operations, instead of deselecting the

device by raising CS, the master clocks the next byte

pointed to by the address pointer.

The sequence ends by the raising of CS.

The MCP23S08 address pointer will roll over to

address zero after reaching the last register address.

1.4 Hardware Address Decoder

The hardware address pins are used to determine the

device address. To address a device, the correspond-

ing address bits in the control byte must match the pin

state.

• MCP23008 has address pins A2, A1 and A0.

• MCP23S08 has address pins A1 and A0.

The pins must be biased externally.

© 2005 Microchip Technology Inc.

DS21919B-page 5

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