DS1337 I2C Serial Real-Time Clock
Figure 3. Data Write—Slave Receiver Mode
<Slave Address>
<Word Address (n)>
<Data(n)>
<Data(n+1)>
<Data(n+X)>
S
1101000 0 A XXXXXXXX
A
XXXXXXXX
A
XXXXXXXX A ... XXXXXXXX A P
S - Start
A - Acknowledge (ACK)
P - Stop
Master to slave
DATA TRANSFERRED
(X+1 BYTES + ACKNOWLEDGE)
Slave to master
Figure 4. Data Read (from Current Pointer Location)—Slave Transmitter Mode
<Data(n+2)>
<Data(n+X)>
<Slave Address>
<Data(n)>
<Data(n+1)>
S
1101000 1 A XXXXXXXX A XXXXXXXX A XXXXXXXX A ... XXXXXXXX A P
S - Start
A - Acknowledge (ACK)
P - Stop
Master to slave
Slave to master
DATA TRANSFERRED
(X+1 BYTES + ACKNOWLEDGE)
NOTE: LAST DATA BYTE IS FOLLOWED BY A NACK
A - Not Acknowledge (NACK)
Figure 5. Data Read (Write Pointer, Then Read)—Slave Receive and Transmit
<Word Address (n)>
<Slave Address>
S
1101000 0 A XXXXXXXX A Sr 1101000 1 A
<Data(n)>
<Data(n+1)>
<Data(n+2)>
<Data(n+X)>
XXXXXXXX
A
XXXXXXXX
A
XXXXXXXX A ... XXXXXXXX A P
S - Start
Sr - Repeated Start
A - Acknowledge (ACK)
P - Stop
Master to slave
Slave to master
DATA TRANSFERRED
(X+1 BYTES + ACKNOWLEDGE)
NOTE: LAST DATA BYTE IS FOLLOWED BY A NACK
A - Not Acknowledge (NACK)
14 of 15
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
