AN2077 查看數據表（PDF） - STMicroelectronics

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AN2077

EEPROM Emulation with STR71x

STMicroelectronics 

EEPROM Emulation with STR71x

Detection Method:

Reset can occur at any time and there is no possibility to prevent this.

Suggested Handling Method:

Restart the Flash command that was interrupted (i.e.: erasing or programming); use status

bits and Flash information to recognize this event.

3.3.2.2 Supply variations

STR71x supply must be kept within the limits published in the Data Sheet during any erase or

programming command.

Detection method:

A specific hardware should be added to monitor the supply and reset the STR71xF device

when the supply is going out of the functional specification.

Suggested Handling Method:

Restart the whole Flash command (i.e.: erasing or programming).

Note As for any other parameter, the STR71x supply should stay within the maximum absolute ratings

defined in the published Data Sheet.

3.3.2.3 Temperature out of specification

Temperature during erasing, programming and read/fetch operations is influencing the relia-

bility of the embedded-Flash.

The embedded-Flash must be programmed and erased only while the junction temperature is

within the limits published in the STR71x Flash Reference Manual (see relevant product doc-

umentation).

Failure to do so, could result in degraded reliability (lower number of erase cycles, lower data

retention).

3.3.2.4 STR71x PLL Unlock

As the Flash program/erase timings are not defined by the STR71x CPU core, PLL unlock has

no effect on the Flash erasing and programming. Usually, PLL unlock will stop communication

because of change in bit/baud rate.

Detection Method:

Not necessary from STR71x point of view (to be checked with application specific constraints).

Suggested Handling Method:

Application-dependent.

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