MCP23009/MCP23S09
FIGURE 1-1:
MCP23009 I2C™ DEVICE PROTOCOL
S OP W ADDR
DIN .... DIN
P
SR OP R DOUT .... DOUT
P
SR OP W ADDR .... 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 W ADDR
SR OP R DOUT
P
Sequential S OP W ADDR
SR OP R DOUT .... DOUT
P
Legend:
S - Start
SR - Restart
P - Stop
W - Write
R - Read
OP - Device opcode
ADDR - Device address
DOUT - Data out from MCP23009
DIN - Data in to MCP23009
DS20002121C-page 8
2009-2014 Microchip Technology Inc.