Rohm LAPIS SEMICONDUCTOR ML620Q503, User Manual

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ML620Q503/Q504 User's Manual
Chapter 15 I
2
C Bus Interface
FEUL620Q504 15–13
15.3.2 Communication Operation Timing
Figures 15-2 to 15-4 show the operation timing and control method for each communication mode.
Figure 15-2 Operation Timing in Data Transmit Mode (Write)
Figure 15-3 Operation Timing in Data Receive Mode (Read)
Figure 15-4 Operation Timing at Data Transmit/Receive Mode (Write/Read) Switching
S P
S
r
TX RX Start
condition
Stop
condition
Restart
condition
Reception of
acknowledg
ment
Transmission
of
acknowledgment
A A A
I2CnSA=”xxxxxxx0B”
I2CnCON=”01H”
I2CnTD=”xxH”
I2CnCON=”01H”
I2CnTD=”xxH”
I2CnCON=”01H”
I2CnTD=”xxH”
I2CnCON=”01H”
Value of
I2CnTD

S
A
6
A
5
A
4
A
3
A
2
A
1
A
0
R
W
A
D
6
D
0
D
7
A
D
6
D
7
D
0
A
D
6
D
7
D
0
A P
I2CnCON=”02H”
Value of
I2CnnTD

Value of
I2CnTD

Value of I2CnSA
Value of
I2CnSA
Value of
I2CnTD

Value of
I2CnTD

Value of
I2CnTD

Register
setting
SDA
I2CMINT
I2nST
I2CnRD
I2CnSA=”xxxxxxx0B”
I2CnCON=”01H”
I2CnTD=”xxH”
I2CnCON=”01H”
S
A
6
A
5
A
0
R
W
A
D
6
D
0
D
7
A P
I2CnCON=”02H”
Value of
I2CnTD

Value of
I2CnSA
Value of I2CnSA Value of I2CnTD

Value of I2CnSA
Receive data

Register
setting
SDA
I2CMINT
I2nST
I2CnRD
I2CnSA=”xxxxxxx1B”
I2CnCON=”05H”
I2CnCON=”81H”
A
6
A
5
A
0
R
W
A
D
6
D
0
D
7
A
Receive
data

Value of I2CnSA
S
r
I2CnSA=”xxxxxxx1B”
I2CnCON=”01H”
I2CnCON=”01H” I2CnCON=”01H” I2CnCON=”81H”
Receive
data

S
A
6
A
5
A
4
A
3
A
2
A
1
A
0
R
W
A
D
6
D
0
D
7
A
D
6
D
7
D
0
A
D
6
D
7
D
0
A P
I2CnCON=”02H”
Receive
data

Receive
data

Value of I2CnSA
Value of I2CnSA
Receive data

Receive data

Receive data

Register
setting
SDA
I2CMINT
I2nST
I2CnRD
Transmission of
Non-
acknowledgment