PSD822F2-70J Ver la hoja de datos (PDF) - STMicroelectronics

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PSD822F2-70J

Configurable Memory System on a Chip for 8-Bit Microcontrollers

STMicroelectronics 

PSD8XX Family

The

PSD835G2

Functional

Blocks

(cont.)

PSD835G2

9.1.1.7.2 Data Toggle (cont.)

It is suggested (as with all Flash memories) to read the location again after the embedded

programming algorithm has completed to compare the word that was written to Flash with

the word that was intended to be written.

When using the Data Toggle method after an erase instructin, Figure 5 still applies. DQ6

will toggle until the erase operation is complete. A ‘1’ on DQ5 will indicate a timeout failure

of the erase operation, a ‘0’ indicates no error. The MCU can read any even location within

the sector being erased to get DQ6 and DQ5.

PSDsoft generates ANSI C code functions which implement these Data Toggling

algorithms.

Figure 5. Data Toggle Flow Chart

START

READ

DQ5 & DQ6

D=Q6

NO

TOGGLE

YES

NO

DQ5

=1

YES

READ DQ6

D=Q6

NO

TOGGLE

YES

FAIL

Program/Erase

Operation Failed

Issue Reset Instruction

PASS

Program/Erase

Operation is

Completed

24

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