Datasheet

© 2007 Microchip Technology Inc. DS21952B-page 7
MCP23017/MCP23S17
FIGURE 1-1: MCP23017 I
2
C™ DEVICE PROTOCOL
S
P
SR
w
R
OP
ADDR
DOUT
DIN
- Start
- Restart
- Stop
- Write
- Read
- Device opcode
- Device register address
- Data out from MCP23017
- Data in to MCP23017
S
P
SR
W
R
OP ADDR
DIN DIN
....
S
P
W
R
OP
ADDR
D OUT
DOUT
....
P
SR WOP
D IN
DIN
....
P
P
SR R
DOUT DOUT
....
P
OP
D OUT
DOUT
....
P
SR OP
DIN
....
P
OP
D IN
S PWOP ADDR
DIN
DIN
....
Byte and Sequential Write
S
W
OP SR R OP
D OUT
DOUT
....
P
Byte and Sequential Read
S WOP ADDR
DIN
P
S W
OP SR ROP
D OUT
P
Byte
Sequential
Byte
Sequential