M50FW040 datasheet(48/53 Pages) STMICROELECTRONICS

Numer części	M50FW040

Szczegółowy opis	4-Mbit (512 Kb x8, uniform block) 3-V supply firmware hub Flash memory

PDF	53 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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48 / 53 page

Flowcharts and pseudo codes

M50FW040

48/53

Flowcharts and pseudo codes

Figure 18.

Program flowchart and pseudo code

A Status check of b1 (Protected Block), b3 (VPP invalid) and b4 (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

AI03407

Start

Write Address

& Data

Read Status

YES

b7 = 1

YES

b3 = 0

b4 = 0

VPP Invalid

Error (1, 2)

Program

Error (1, 2)

Program command:

– write 40h or 10h

– write Address & Data

(memory enters read status state after

the Program command)

do:

–read Status Register if Program/Erase

Suspend command given execute

suspend program loop

while b7 = 1

If b3 = 1, VPP invalid error:

– error handler

If b4 = 1, Program error:

– error handler

YES

End

YES

b1 = 0

Program to Protected

Block Error (1, 2)

If b1 = 1, Program to protected block error:

– error handler

Suspend

Loop

YES

FWH

Interface

Only

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