DS1338 Maxim, DS1338 Datasheet - Page 14

• Manufacturer Part Number: DS1338
• Description: The DS1338 serial real-time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM
• Manufacturer: Maxim

Figure 6. Data Write—Slave Receiver Mode
Figure 7. Data Read (From Current Pointer Location)—Slave Transmitter Mode
Figure 8. Data Read (Write Pointer, Then Read—Slave Receive and Transmit
S - START
A - ACKNOWLEDGE (ACK)
P - STOP
S
S - START
A - ACKNOWLEDGE (ACK)
P - STOP
A
- NOT ACKNOWLEDGE (NACK)
S
<Slave Address>
<Slave Address>
1101000
1101000
A - NOT ACKNOWLEDGE (NACK)
S - START
SR - REPEATED START
A - ACKNOWLEDGE (ACK)
P - STOP
XXXXXXXX
S
<Data (n)>
0
1101000
1
A
A
<Word Address (n)>
XXXXXXXX
SLAVE TO MASTER
MASTER TO SLAVE
XXXXXXXX
A
<Data (n)>
0
XXXXXXXX A XXXXXXXX A
<Data (n+1)>
MASTER TO SLAVE
SLAVE TO MASTER
A
<Word Address (n)>
XXXXXXXX
A
SLAVE TO MASTER
MASTER TO SLAVE
A
XXXXXXXX A XXXXXXXX A
<Data (n)>
XXXXXXXX A XXXXXXXX
<Data (n+1)>
14 of 16
<Data (n+2)>
A
Sr
NOTE: LAST DATA BYTE IS FOLLOWED BY A NACK
(X+1 BYTES + ACKNOWLEDGE)
<Slave Address>
DATA TRANSFERRED
1101000
<Data (n+1)>
(X+1 BYTES + ACKNOWLEDGE)
<Data (n+2)>
NOTE: LAST DATA BYTE IS FOLLOWED BY A NACK
...
DATA TRANSFERRED
1
XXXXXXXX A P
DS1338 I
<Data (n+X)>
A
(X+1 BYTES + ACKNOWLEDGE)
A
DATA TRANSFERRED
...
...
2
XXXXXXXX A P
C RTC with 56-Byte NV RAM
<Data (n+X)>
XXXXXXXX A P
<Data (n+X)>