MCP23017-ESLASHSS datasheet(14/42 Pages) MICROCHIP

14 / 42 page

MCP23017/MCP23S17

DS20001952C-page 14

 2005-2016 Microchip Technology Inc.

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

generating a Stop or Restart condition.

FIGURE 3-2:

BYTE AND SEQUENTIAL READ

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

and Sequential Mode” for details regarding sequential

operation control).

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.

FIGURE 3-3:

MCP23017 I2C DEVICE PROTOCOL

DOUT

....

DOUT

Byte

Sequential S

ADDR

DIN

....

ADDR

DOUT

D OUT

....

DIN

....

DOUT

....

DIN

....

DIN

DOUT

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