M50FLW040B View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M50FLW040B

4-Mbit (5 × 64 Kbyte blocks + 3 × 16 × 4 Kbyte sectors) 3-V supply Firmware Hub / low-pin count Flash memory

STMicroelectronics 

M50FLW040A, M50FLW040B

Flowcharts and pseudo codes

Figure 26. Sector/Block Erase flowchart and pseudo code

Start

Write 20h/32h

Write Block

Address and D0h

Read Status

Register

NO

Suspend

YES

NO

SR7 = 1

Suspend

Loop

Block Erase command:

– Write 20h/32h

– Write block Address and D0h

(memory enters read Status Register after

the Block Erase 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

YES

NO

SR3 = 0

YES

VPP Invalid

Error (1)

If SR3 = 1,

– Enter the "VPP invalid" error handler

NO

SR4, SR5 = 0

Command

Sequence Error (1)

If SR4, SR5 = 1,

– Enter the "Command sequence"error handler

YES

NO

SR5 = 0

Erase Error (1)

If SR5 = 1,

– Enter the "Erase Error" error handler

FWH/LPC

Interface

Only

YES

NO

SR1 = 0

YES

End

Erase to Protected

Block Error (1)

If SR1 = 1,

– Enter the "Erase to protected block"

error handler

AI08424B

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

operations.

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