RV-4162 Datasheet, PDF (27/39 Pages) MICORO CRYSTAL SWITZERLAND – Ultra Small Real Time Clock

Micro Crystal
Ultra Small Real Time Clock / Calendar Module
RV-4162
6.2.2.READ MODE AT SPECIFIC ADDRESS
Master reads data after setting Word Address:
1) Master sends out the “Start Condition”.
2) Master sends out the “Slave Address”, D0h for the RV-4162; the R/ W bit in write mode.
3) Acknowledgement from the RV-4162.
4) Master sends out the “Word Address” to the RV-4162.
5) Acknowledgement from the RV-4162.
6) Master sends out the “Re-Start Condition” (“Stop Condition” followed by “Start Condition”)
7) Master sends out the “Slave Address”, D1h for the RV-4162; the R/ W bit in read mode.
8) Acknowledgement from the RV-4162.
At this point, the Master becomes a Receiver, the Slave becomes the Transmitter.
9) The Slave sends out the “data” from the Word Address specified in step 4).
10) Acknowledgement from the Master.
11) Steps 9) and 10) can be repeated if necessary.
The address will be incremented automatically in the RV-4162.
12) The Master, addressed as Receiver, can stop data transmission by not generating an acknowledge on the
last byte that has been sent from the Slave-Transmitter. In this event, the Slave-Transmitter must leave the
data line HIGH to enable the Master to generate a stop condition.
13) Master sends out the “Stop Condition”.
1
2
3
4
56
7
8
9
10
S
SLAVE ADDRESS 0 A
WORD ADDRESS
AP S
SLAVE ADDRESS 1 A
DATA
A
11
DATA
12 13
AP
Acknowledge from RV-4162
Acknowledge from Master
No acknowledge
6.2.3.READ MODE
Master reads Slave-Transmitter immediately after first byte:
1) Master sends out the “Start Condition”.
2) Master sends out the “Slave Address”, D1h for the RV-4162; the R/ W bit in read mode.
3) Acknowledgement from the RV-4162.
At this point, the Master becomes a Receiver, the Slave becomes the Transmitter
4) The RV-4162 sends out the “data” from the last accessed Word Address incremented by 1.
5) Acknowledgement from the Master.
6) Steps 4) and 5) can be repeated if necessary.
The address will be incremented automatically in the RV-4162.
7) The Master, addressed as Receiver, can stop data transmission by not generating an acknowledge on the
last byte that has been sent from the Slave-Transmitter. In this event, the Slave-Transmitter must leave the
data line HIGH to enable the Master to generate a stop condition.
8) Master sends out the “Stop Condition”.
1
2
3
4
5
S
SLAVE ADDRESS 1 A
DATA
A
6
DATA
78
AP
Acknowledge from RV-4162
Acknowledge from Master
No acknowledge
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