AN1477 Emulated Data EEPROM with XFlash Memory Application Note

About this manual

When the dedicated data EEPROM is unavailable in an ST7 device, it can be emulated by utilizing the XFlash memory. This document details the emulation process specifically for the ST72F264 device, outlining necessary limitations such as program memory location requirements and execution constraints during programming.

The note provides a step-by-step procedure to program one byte in the emulated data EEPROM located in sector 1. It includes an assembler program example that demonstrates how to enter the RASS key, download the driver into RAM, and execute the programming routine while managing interrupts.

What's inside

• Introduction
• Restrictions
• Procedure
• Assembler Program Example

Frequently asked questions

What is the maximum size of program memory when using emulated data EEPROM?

The maximum program memory size is limited to 4 Kbytes.

How much RAM is required for the software that programs the emulated data EEPROM?

The programming software needs at least 16 bytes of RAM.

How long does it take for the emulated data EEPROM programming to complete?

The end of programming takes approximately 5 milliseconds.