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.