M50FW080 datasheet(49/56 Pages) STMICROELECTRONICS

49 / 56 page

M50FW080

Flowcharts and pseudo codes

49/55

Appendix A

Flowcharts and pseudo codes

Figure 18.

Program flowchart and pseudo code

A Status check of SR1 (Protected Block), SR3 (VPP invalid) and SR4 (Program Error) can be made after

each Program operation by following the correct command sequence.

If an error is found, the Status Register must be cleared before further Program/Erase Controller

operations.

Write 40h or 10h

AI08425B

Start

Write Address

and Data

Read Status

YES

SR7 = 1

YES

SR3 = 0

SR4 = 0

VPP Invalid

Error (1, 2)

Program

Error (1, 2)

Program command:

– Write 40h or 10h

– Write Address and Data

(memory enters read status state after

the Program command)

do:

– Read Status Register

– If SR7=0 and a Program/Erase Suspend

command has been executed

– SR7 is set to 1

– Enter suspend program loop

If SR3 = 1,

– Enter the "VPP invalid" error handler

If SR4 = 1,

– Enter the "Program error" error handler

YES

End

YES

SR1 = 0

Program to Protected

Block Error (1, 2)

If SR1 = 1,

– Enter the "Program to protected

block" error handler

Suspend

Loop

YES

FWH/LPC

Interface

Only

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