SC620
Using the I 2 C Serial Port (continued)
I 2 C Direct Format Write
S
Slave Address
W
A
Register Address
A
Data
A
P
S – Start Condition
W – Write = ‘0’
A – Acknowledge (sent by slave)
Slave Address – 7-bit
Register address– 8-bit
Data – 8-bit
P – Stop condition
I 2 C Stop Separated Format Read
Register Address Setup Access
Master Addresses
other Slaves
Register Read Access
S Slave Address W A   Register Address   A   P   S
Slave Address B
S/Sr
Slave Address
R A
Data
NACK P
S – Start Condition
W – Write = ‘0’
R – Read = ‘1’
A – Acknowledge (sent by slave)
NAK – Non-Acknowledge (sent by master)
Sr – Repeated Start condition
P – Stop condition
I 2 C Combined Format Read
Slave Address – 7-bit
Register address – 8-bit
Data – 8-bit
S
Slave Address
W A
Register Address
A Sr
Slave Address
R
A
Data
NACK P
S – Start Condition
W – Write = ‘0’
R – Read = ‘1’
Slave Address – 7-bit
Register address – 8-bit
Data – 8-bit
A – Acknowledge (sent by slave)
NAK – Non-Acknowledge (sent by master)
Sr – Repeated Start condition
P – Stop condition
16
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