M50FLW080A datasheet(61/64 Pages) STMICROELECTRONICS

Part #	M50FLW080A

Description	8 Mbit (13 x 64KByte Blocks 3 x 16 x 4KByte Sectors), 3V Supply Firmware Hub / Low Pin Count Flash Memory

PDF	64 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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61 / 64 page

M50FLW080A, M50FLW080B

Flowcharts and pseudo codes

61/64

Figure 26.

Sector/Block Erase flowchart and pseudo code

If the Block Erase command is used on a block that is split into 4KByte sectors, each of the 16 sectors of

the block should be unlocked before performing the erase operation.

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

operations.

Write 20h/32h

AI09094

Start

Write Block/Sector

Address and D0h

Read Status

YES

SR7 = 1

YES

SR3 = 0

SR4, SR5 = 0

VPP Invalid

Error (1)

Command

Sequence Error (1)

Block/Sector Erase command:

– Write 20h/32h

– Write Block/Sector Address and D0h

(memory enters read Status Register after

the Block/Sector 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

If SR3 = 1,

– Enter the "VPP invalid" error handler

If SR4, SR5 = 1,

– Enter the "Command sequence"error handler

YES

SR5 = 0

Erase Error (1)

YES

Suspend

Loop

If SR5 = 1,

– Enter the "Erase Error" error handler

End

YES

SR1 = 0

Erase to Protected

Block/Sector Error (1)

If SR1 = 1,

– Enter the "Erase to protected Block/Sector"

error handler

YES

FWH/LPC

Interface

Only

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