Cirrus Logic CS4953xx - Manual (Page 38)

I2C Port
CS4953xx Hardware User’s Manual
DS732UM10 Copyright 2010 Cirrus Logic, Inc 3-6
Figure 3-5. Data Byte with ACK and NACK
After an ACK or NACK from the master or slave, the slave must leave the SCP1_SDA line high so the
master can then generate either another Start condition as shown in
Figure 3-6 to start a new transfer or a
Stop condition as shown in Figure 3-7 to abort the transfer.
Figure 3-6. Repeated Start Condition with ACK and NACK
Start
SCP1_CLK
SCP1_SDA A[6] A[5] A[4] A[3] A[2] A[1] A[0] R/W ACK Data Byte ACK
M S M S Write
M S S M Read
Start
SCP1_CLK
SCP1_SDA A[6] A[5] A[4] A[3] A[2] A[1] A[0] R/W ACK Data Byte NACK
M S M S Write
M S S M Read
M = Master Drives SDA
S = Slave Drives SDA
S C P 1 _ C L K
S C P 1 _ S D A D a t a B y te N A C K
S t a r t
A [ 6 ] A [ 5 ] A [ 4 ] A [3 ] A [2 ] A [ 1 ] A [ 0 ] R / W A C K
M S M S W r ite
S M M S R e a d
M = M a s te r D r iv e s S D A
S = S la v e D r iv e s S D A
SCP1_CLK
SCP1_SDA Data Byte ACK
Start
A[6] A[5] A[4] A[3] A[2] A[1] A[0] R/W ACK
M S M S Write
S M M S Read