8.5.4 Write SRAM

The on-chip SRAM is a volatile, shadow memory array used to temporarily store register data, and is intended only for programming the non-volatile EEPROM. The SRAM has the identical data format as the EEPROM map. The register configuration data can be transferred to the SRAM array through special memory access registers in the register map. To successfully program the SRAM, the complete base array and at least one page should be written. The following details the programming sequence to transfer the device registers into the SRAM.

1. Program the device registers to match a desired setting.
2. Write a 1 to R49[6]. This ensures that the device registers are copied to the SRAM.

The SRAM can also be written with particular values according to the following programming sequence.

1. Write the SRAM address in R51.
2. Write the desired data byte in R53 in the same I²C transaction and this data byte will be written to the address specified in the step above. Any additional access that is part of the same transaction will cause the SRAM address to be incremented and a write will take place to the next SRAM address. Access to SRAM will terminate at the end of current I²C transaction.