AN1502 Datasheet PDF - STMicroelectronics

INTRODUCTION
   When the data EEPROM is not available in a ST7 device, it can be emulated by the HDFlash memory with some restrictions. This Application Note describes how to emulate this feature with a ST72F521 device and the restrictions this emulation implies.
   Data EEPROM can be emulated in all HDFlash devices.

   AS HDFlash is a dual voltage FLASH memory, the 12-volt programming voltage must be provided on the application board (a pull-down on ICPSEL on the application board is advised).
   For more information concerning ST7 programming, a .zip file is included with the complete corresponding code for the ST72F521, visit our web site at www.st.com.