AN2692

Embedded application aspects

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As a consequence:

●

Block 0 (that starts at physical address: 00 0000h) should never be erased during field

reprogramming.

●

Block 0 should contain all the routines that make it possible to restart the

reprogramming routines (if those routines are in another block, this block also should

never be erased).

Note:

This restriction on block 0 does not apply if the ST10F269Zx Bootstrap Loader mode is used

for field reprogramming (see Code protection and bootstrap loader on page 18 paragraph if

code protection is used).

Flash bock write protection

It is recommended to use the Flash memory Set Block Protection command to protect the

block(s) which contains all the needed software to restart the reprogramming routines. Any

inadvertent Chip Erase command will not affect those protected blocks.

Reset and other blocks

Suggested method of handling: reset during erase and/or program should be detected

externally. In such a case, the entire "erasing" or "erasing + programming" process should

be restarted. Detection of reset during erasing or reprogramming should be done by

external resources (hardware, protocol between ST10 and the programming station).

3.2.3

List of events and suggested handling methods

Supply variations

The ST10F269Zx supply must remain within the supply voltage range specified in the

published datasheet during any erase or program command.

Detection method

Specific hardware should be added to monitor the supply, and reset the device when the

ST10F269Zx supply is going out of the functional specification (see datasheet).

Suggested handling method

Restart the whole reprogramming sequence at module level (i.e.: erasing + programing).

Note:

As for any other parameter, the ST10F269Zx supply should stay within the maximum

absolute ratings defined in the published datasheet.

Temperature out of specification

Temperature during erase, program and operation has an influence on the reliability of

ST10F269Zx devices.

The embedded Flash memory may be programmed and erased only while the junction

temperature is within the range specified in the ST published datasheet (see ST10F269Zx

datasheet).

Failure to keep the device within the temperature ranges specified in the product datasheet

could result in degraded reliability (lower number of erase cycles, lower data retention).