DS1337 Maxim, DS1337 Datasheet - Page 14

• Manufacturer Part Number: DS1337
• Description: The DS1337 serial real-time clock is a low-power clock/calendar with two programmable time-of-day alarms and a programmable square-wave output
• Manufacturer: Maxim

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