CHAPTER 4 I
2
C COMMUNICATIONS
User’s Manual U18438EJ2V0UD
60
SCL
1
2
7
8
9
1
2
ID6
ID5
ID0
W
ACK
SDA
0
0
SCL0
1
2
7
8
9
1
2
ID6
ID5
ID0
W
SDA0
0
0
SCL
ACK
SDA
Master
IIC shift
register 0
xxH
xxH
xxH
xxH
xxH
xxH
xxH
xxH
xxH
xxH
xxH
xxH
Write to IIC shift register 0
Setup
IIC bus
8
9
xxH
xxH
A0
8
9
A0
ACK
xxH
xxH
xxH
xxH
xxH
ACK
1
2
7
8
9
1
8
2
9
Slave
Start condition
Setup
Start condition
IIC shift
register
Figures 4-13 shows the timing chart of the read operation.
Figure 4-13. Timing Chart of Read Operation
(Continued from above)
1
8
9
1
ID6
R
ACK
RD7
1
8
9
1
ID6
R
RD7
ACK
xxH
xxH
xxH
xxH
xxH
xxH
xxH
Setup
8
9
RD0
8
9
RD0
ACK
ACK
xxH
xxH
xxH
FFH
Write FFH or WREL0 = 1
xxH
1
8
9
1
8
9
RD7
RD0
RD7
RD0
xxH
xxH
xxH
xxH
xxH
xxH
xxH
xxH
FFH
Write FFH or WREL0 = 1
Restart condition
Stop condition
1
8
9
1
8
9
8
1
Stop condition
9
SCL
SDA
SCL0
SDA0
SCL
SDA
Master
IIC shift
register 0
IIC shift
register
IIC bus
Slave
Setup
Write to IIC shift register 0
Setup
Write to IIC shift register
Write to IIC shift register
Write to IIC shift register
Restart condition