AN2540 datasheet(22/25 Pages) STMICROELECTRONICS

Part #	AN2540

Description	EEPROM emulation in STR91xFxx devices

PDF	25 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Embedded application aspects

AN2540 - Application note

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4.4.2

Program timing

The following table gives an idea about the emulated EEPROM write time related to the

current implementation.

It is clear that updating a variable with the 1st method scheme takes less time than with the

2nd method scheme since only the corresponding allocated memory space is accessed in

the first case and not the whole sector.

Table 9.

Write time related to the current implementation

Implemented scheme

Parameter

Write time (typical)

Write time (max)(1)

This is the time taken to update a variable that makes a call to the EepromSectorTransfer(..) function. It is

nearly equal to the sector erase time.

1st method scheme

20 µs

300 ms

2nd method scheme

30 µs

300 ms

AN2540 Datasheet(PDF) 22 Page - STMicroelectronics