PSD914F3-90 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

PSD914F3-90

Flash In-System-Programmable Peripherals for 16-Bit MCUs

STMicroelectronics 

PSD4000 Series

The

PSD4000

Functional

Blocks

(cont.)

Preliminary Information

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 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 4 still applies. DQ6

(DQ14) will toggle until the erase operation is complete. A ‘1’ on DQ5 (DQ13) 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 (DQ14) and DQ5 (DQ13) .

PSDsoft generates ANSI C code functions which implement these Data Toggling

algorithms.

Figure 4. Data Toggle Flow Chart

START

READ DQ5 & DQ6

(DQ13 & DQ14)

at VALID EVEN ADDRESS

DQ6

(DQ14)

=

NO

TOGGLE

YES

NO

DQ5

(DQ13)

=1

YES

READ DQ6

(DQ14)

DQ6

(DQ14)

=

NO

TOGGLE

YES

FAIL

Program/Erase

Operation Failed

Issue Reset Instruction

PASS

Program/Erase

Operation is

Completed

22

Share Link: