M50FLW080A datasheet(28/64 Pages) STMICROELECTRONICS

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Command interface

M50FLW080A, M50FLW080B

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4.7

Chip Erase command

The Chip Erase Command erases the entire memory array, setting all of the bits to ‘1’. All

previous data in the memory array are lost. This command, though, is only available under

the A/A Mux interface.

Two Bus Write operations are required to issue the command, and to start the

Program/Erase Controller. Once the command is issued, subsequent Bus Read operations

read the contents of the Status Register. (See the section on the Status Register for details

on the definitions of the Status Register bits.)

Erasing should not be attempted when VPP is not at VPPH, otherwise the result is uncertain.

During the Chip Erase operation, the memory will only accept the Read Status Register

command. All other commands are ignored.

See Figure 25, for a suggested flowchart on using the Chip Erase command. Typical Chip

Erase times are given in Table 18.

4.8

Block Erase command

The Block Erase command is used to erase a block, setting all of the bits to ‘1’. All previous

data in the block are lost.

Two Bus Write operations are required to issue the command. The second Bus Write cycle

latches the block address and starts the Program/Erase Controller. Once the command is

issued, subsequent Bus Read operations read the contents of the Status Register. (See the

section on the Status Register for details on the definitions of the Status Register bits.)

If the block, or if at least one sector of the block (for the blocks that are split into sectors), is

protected (FWH/LPC only) then the Block Erase operation will abort, the data in the block

will not be changed, and the Status Register will indicate the error.

During the Block Erase operation the memory will only accept the Read Status Register and

Program/Erase Suspend commands. All other commands are ignored.

See Figure 26, for a suggested flowchart on using the Block Erase command. Typical Block

Erase times are given in Table 18.

4.9

Sector Erase command

The Sector Erase command is used to erase a Uniform 4-KByte Sector, setting all of the bits

to ‘1’. All previous data in the sector are lost.

Two Bus Write operations are required to issue the command. The second Bus Write cycle

latches the Sector address and starts the Program/Erase Controller. Once the command is

issued, subsequent Bus Read operations read the contents of the Status Register. (See the

section on the Status Register for details on the definitions of the Status Register bits.)

If the Sector is protected (FWH/LPC only), the Sector Erase operation will abort, the data in

the Sector will not be changed, and the Status Register will indicate the error.

During the Sector Erase operation the memory will only accept the Read Status Register

and Program/Erase Suspend commands. All other commands are ignored.

See Figure 26, for a suggested flowchart on using the Sector Erase Command. Typical

Sector Erase times are given in Table 18.

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