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MCP23017-E/ML 数据表(PDF) 14 Page - Microchip Technology

部件名 MCP23017-E/ML
功能描述  16-Bit I/O Expander with Serial Interface
PDF  42 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP23017-E/ML 数据表(HTML) 14 Page - Microchip Technology

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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
register. The sequence is ended with the master
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
SR
R
OP
DOUT
DOUT
....
P
S
W
OP
SR
R
OP
DOUT
P
Byte
Sequential S
W
OP
S
P
SR
W
R
OP
ADDR
DIN
DIN
....
P
W
OP
ADDR
DOUT
D OUT
....
P
SR
W
OP
DIN
DIN
....
P
P
SR
R
DOUT
DOUT
....
P
OP
....
P
SR
OP
DIN
....
P
DIN
DOUT
DOUT
S
R
OP



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