RV-3029 Datasheet, PDF (52/67 Pages) MICORO CRYSTAL SWITZERLAND – DTCXO Temperature Compensated Real Time Clock

Micro Crystal
DTCXO Temperature Compensated Real Time Clock / Calendar Module
RV-3029
6.8.2.READ MODE DATA TRANSMISSION AT SPECIFIC ADDRESS
• With the first byte, the Master has addressed the RV-3029 in Write Mode
• The next byte contains the Page & Word Address. The upper 5 bits address a specific “Memory Page”,
the 3 lower bits are the auto incrementing address part
• The I²C interface communication is halted by sending the “Stop Condition”
• Then the I²C interface communication is re-established by sending the “Start Condition”
• With the next byte, the Master is addressing the RV-3029 in Read Mode
• Then the Slave transmits the first byte starting from the previously addressed Page & Word address.
Within the same Memory Page, the Word Address will be incremented automatically by 1.
If “acknowledge” is not received, no auto increment of the address is executed and a following reading
transmits data of the same address
Example of Data Transmission in Read Mode after setting a specific Page & Word address
1) Master sends out the “Start condition”
2) Master sends out the “Slave Address”, ACh for the RV-3029; the R/ W bit = “0” for write mode
3) Acknowledgement from the RV-3029
4) Master sends out the “Page & Word Address” to the RV-3029
5) Acknowledgement from the RV-3029
6) Master sends out the “Stop Condition”
7) Master sends out the “Start Condition”
8) Master sends out the “Slave Address”, ADh for the RV-3029; the R/ W bit =”1” for read mode
9) Acknowledgement from the RV-3029:
At this point, the Master becomes a Receiver, the Slave becomes the Transmitter
10) The RV-3029 sends out the “Data” from the “Page & Word Address” specified in step 4)
11) Acknowledgement from the Master:
At this time, the “Page & Word” Address will be automatically incremented by 1
12) Steps 10) and 11) can be repeated if necessary. Within the same Page Address, the Word Address will
be incremented automatically
13) 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”
14) Master sends out the “Stop Condition”
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