PSD942F2-15UI 查看數據表（PDF） - STMicroelectronics

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PSD942F2-15UI

Flash In-System Programmable (ISP) Peripherals For 8-bit MCUs

STMicroelectronics 

Preliminary Information

PSD9XX Family

The

PSD9XX

Functional

Blocks

(cont.)

9.1.1.6.2 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 byte that was written to Flash with

the byte that was intended to be written.

When using the Data Toggle method after an erase instructin, Figure 4 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 location within the

sector being erased to get DQ6 and DQ5.

PSDsoft will generate ANSI C code functions which implement these Data Toggling

algorithms.

Figure 4. 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 Not

Complete, Issue

Reset Instruction

PASS

Program/Erase

Operation is

Complete

23

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