M50FW080 datasheet(50/56 Pages) STMICROELECTRONICS

50 / 56 page

Flowcharts and pseudo codes

M50FW080

50/55

Figure 19.

Quadruple Byte Program flowchart and pseudo code (A/A Mux interface

only)

A Status check of 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.

Address1, Address 2, Address 3 and Address 4 must be consecutive addresses differing only for address

bits A0 and A1.

AI08437B

Write Address 4

& Data 4 (3)

Read Status

YES

SR7 = 1

YES

SR3 = 0

SR4 = 0

VPP Invalid

Error (1, 2)

Program

Error (1, 2)

Quadruple Byte Program command:

– write 30h

– write Address 1 & Data 1 (3)

– write Address 2 & Data 2 (3)

– write Address 3 & Data 3 (3)

– write Address 4 & Data 4 (3)

(memory enters read status state after

the Quadruple Byte 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, VPP invalid error:

– error handler

If SR4 = 1, Program error:

– error handler

End

YES

Suspend

Loop

YES

Write 30h

Start

Write Address 1

& Data 1 (3)

Write Address 2

& Data 2 (3)

Write Address 3

& Data 3 (3)

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