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TC1321
DS21387C-page 10
2010 Microchip Technology Inc.
FIGURE 4-1:
SMBus/I2CTiming Diagrams.
t
SU(START) tH(START)
t
SU-DATA
t
SU(STOP)
t
IDLE
A = START Condition
B = MSB of Address Clocked into Slave
C = LSB of Address Clocked into Slave
D = R/W Bit Clocked into Slave
A
Write Timing Diagram
Read Timing Diagram
B
CD
E F
G
H
I
J
K
E = Slave Pulls SDA Line Low
F = Acknowledge Bit Clocked into Master
G = MSB of Data Clocked into Master
H = LSB of Data Clocked into Master
I
LOW IHIGH
I = Acknowledge Clock Pulse
J = STOP Condition
K = New START Condition
SCL
SDA
t
SU(START) tH(START)
t
SU-DATA
t
H-DATA
t
SU(STOP) tIDLE
A = START Condition
B = MSB of Address Clocked into Slave
C = LSB of Address Clocked into Slave
D = R/W Bit Clocked into Slave
E = Slave Pulls SDA Line Low
A
B
CD
E F
G
H
I J
KL
M
F = Acknowledge Bit Clocked into Master
G = MSB of Data Clocked into Slave
H = LSB of Data Clocked into Slave
I = Slave Pulls SDA Line Low
J = Acknowledge Clocked into Master
K = Acknowledge Clock Pulse
L = STOP Condition, Data Executed by Slave
M = New START Condition
I
LOW
I
HIGH
SCL
SDA