Datasheet

 2002-2013 Microchip Technology Inc. DS21737B-page 5
TC664/TC665
FIGURE 1-1: Bus Timing Data.
t
SU(START)
t
H(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
E = Slave Pulls SDA Line Low
A
B
CD
E FG 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
t
LOW
t
HIGH
SCLK
SDA
t
H-DATA
SMBus Write Timing Diagram
t
SU(START)
t
H(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
B
CDEFG H
IJ
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
t
LOW
t
HIGH
I = Acknowledge Clock Pulse
J = Stop Condition
K = New Start Condition
SCLK
SDA
SMBus Read Timing Diagram
E