How does flash memory work on wp 34s?

[mfleming]

(05-12-2018 12:08 AM)gomefun2 Wrote:  Is it even possible to have a program store variables to flash memory?

With a processor having a Harvard architecture (separate data and program address spaces) the answer is (a qualified) no. That architecture usually allows reads from flash to access constants in a table, but not direct writes.

Microchip had a routine for its PIC processors that allowed a program in RAM to erase and rewrite a block of program flash so it could simulate EEPROM. The program had to be in RAM of course because a program in flash would no longer be able to access itself once the flash erase/ update process began!

~Mark