Micro Crystal

Real Time Clock / Calendar Module

RV-8564

27/40

11.2.2. 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”, A2h for the RV-8564; the R/ W bit in write mode.

3) Acknowledgement from the RV-8564.

4) Master sends out the “Word Address” to the RV-8564.

5) Acknowledgement from the RV-8564.

6) Master sends out the “Start Condition”. “Stop Condition” has not been sent.

7) Master sends out the “Slave Address”, A3h for the RV-8564; the R/ W bit in read mode.

8) Acknowledgement from the RV-8564.

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-8564.

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”.

11.2.3. READ MODE

Master reads Slave-Transmitter immediately after first byte

1) Master sends out the “Start Condition”.

2) Master sends out the “Slave Address”, A3h for the RV-8564; the R/ W bit in read mode.

3) Acknowledgement from the RV-8564.

At this point, the Master becomes a Receiver, the Slave becomes the Transmitter

4) The RV-8564 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-8564.

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”.