MCP23017 查看數據表（PDF） - Microchip Technology

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MCP23017

16-Bit I/O Expander with Serial Interface

Microchip Technology 

MCP23017/MCP23S17

3.2.2.2 I2C Read Operation

I2C Read operations include the control byte sequence,

as shown in Figure 3-2. This sequence is followed by

another control byte (including the Start condition and

ACK) with the R/W bit set (R/W = 1). The MCP23017

then transmits the data contained in the addressed

register. The sequence is ended with the master

generating a Stop or Restart condition.

FIGURE 3-2:

BYTE AND SEQUENTIAL READ

Byte S OP W

SR OP R DOUT

P

Sequential S OP W

SR OP R DOUT .... DOUT

P

3.2.2.3 I2C Sequential Write/Read

For sequential operations (Write or Read), instead of

transmitting a Stop or Restart condition after the data

transfer, the master clocks the next byte pointed to by

the address pointer (see Section 3.2.1 “Byte Mode

The sequence ends with the master sending a Stop or

Restart condition.

The MCP23017 Address Pointer will roll over to

address zero after reaching the last register address.

Refer to Figure 3-3.

and Sequential Mode” for details regarding sequential

operation control).

FIGURE 3-3:

MCP23017 I2C DEVICE PROTOCOL

S OP W ADDR

DIN .... DIN

P

SR OP R DOUT .... D OUT

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

DS20001952C-page 14

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