Could anyone show me by example how to save 1 byte data into flash memory and get it back to the variable? I create a variable POWEROFF, and I give 1 to this variable in the main routine. I need to save the content of POWEROFF to a (any)location in flash memory before the MCU is disconnected from power. Then I need to get this data back into this variable when MCU is connected to power again.
I tried to use those supporting routines in ROM, such as RDVRRNG, PRGRNGE and ERARNGE. So far I am getting no where. I hope someone can show me an example in assembly code.
INCLUDE 'derivative.inc' ; MC68HC908QY4A
poweroff ds 1