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When PCF2129 information should be read/write?

Question asked by Fabian Romo on Sep 24, 2019
Latest reply on Sep 26, 2019 by Tomas Vaverka



I have managed to send and receive information from the PCF2129 via SPI with a microcontroller.


Both writing and reading is done from address 0x03 (seconds) to address 0x09 (years).


But I have discovered that sometimes you write or receive erroneous data. For example, once the RTCC has been correctly matched, both time and date, such information obtains inconsistent data.


I read section 8.8.8 of the datasheets and it indicates that regions from address 0x03 to 0x09 are blocked for security.

Could that be the cause that sometimes I get incongruous data?


If the answer is yes, my question is: How can I know what is the right time to read the information from these regions of the RAM?



Any comments or suggestions are welcome.