MCP23018/MCP23S18
2
FIGURE 1-1:
MCP23018 I C™ DEVICE PROTOCOL
- Start
S
SR
P
- Restart
DIN
DIN
S
OP
W
ADDR
....
P
- Stop
- Write
- Read
w
DOUT
DIN
D
OUT
SR
OP
OP
R
P
P
....
....
R
ADDR
SR
P
W
- Device opcode
ADDR - Device address
OP
- Data out from MCP23018
- Data in to MCP23018
DOUT
DIN
DOUT
DOUT
S
OP
R
P
....
DOUT
DOUT
SR
OP
R
P
....
DIN
....
DIN
P
SR
OP
W
ADDR
P
Byte and Sequential Write
DIN
DIN
S
S
OP
OP
W
W
ADDR
ADDR
P
Byte
DIN
....
P
Sequential
Byte and Sequential Read
D
OUT
Byte
S
S
OP
OP
W
W
ADDR
ADDR
SR
OP
R
R
P
D
OUT
Sequential
DOUT
....
P
SR OP
© 2008 Microchip Technology Inc.
DS22103A-page 9
MICROCHIP [ MICROCHIP ]
