- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
70
Limitations when Using EEPROM
When using an empty EEPROM for the first time, first perform a full EEPROM write.
If the system starts without an EEPROM, do not perform an EEPROM category specification write (a full write
can be performed).
If the EEPROM does not contain valid data, and the port driver (CXD3172AR’s P12 to P15) MODESEL setting
does not match the operating mode, then the operation may not work properly and communication may fail. In
such cases, it is not possible to write initial value data to the EEPROM.
Change the port driver MODESEL setting so that it matches the operating mode so that the system runs
properly, and then write the initial value data to the EEPROM.
Once the initial value data are written to the EEPROM (in cases where the EEPROM contains valid data), the
MODESEL value written to the EEPROM will be applied, so another function can be assigned to port driver
MODESEL.