M50LPW080 datasheet(17/44 Pages) STMICROELECTRONICS

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M50LPW080

Chip Erase Command. The Chip Erase Com-

mand can be only used in A/A Mux mode to erase

the entire chip at a time. Erasing should not be at-

tempted when VPP is not at VPPH. The operation

can also be executed if VPP is below VPPH, but re-

sult could be uncertain. Two Bus Write operations

are required to issue the command and start the

Program/Erase Controller. Once the command is

issued subsequent Bus Read operations read the

Status Register. See the section on the Status

memory will only accept the Read Status Register

command. All other commands will be ignored.

Typical Chip Erase times are given in Table 15..

The Chip Erase command sets all of the bits in the

memory to ‘1’. See Figure 20. for a suggested

flowchart on using the Chip Erase command.

Block Erase Command. The Block Erase com-

mand can be used to erase a block. Two Bus Write

operations are required to issue the command; the

second Bus Write cycle latches the block address

in the internal state machine and starts the Pro-

gram/Erase Controller. Once the command is is-

sued subsequent Bus Read operations read the

Status Register. See the section on the Status

If the block is protected then the Block Erase oper-

ation will abort, the data in the block will not be

changed and the Status Register will output the er-

ror.

During the Block Erase operation the memory will

only accept the Read Status Register command

and the Program/Erase Suspend command. All

other commands will be ignored. Typical Block

Erase times are given in Table 15..

The Block Erase command sets all of the bits in

the block to ‘1’. All previous data in the block is

lost.

See Figure 21. for a suggested flowchart on using

the Block Erase command.

Clear Status Register Command. The

Clear

Status Register command can be used to reset

bits 1, 3, 4 and 5 in the Status Register to ‘0’. One

Bus Write is required to issue the Clear Status

the memory returns to its previous mode, subse-

quent Bus Read operations continue to output the

same data.

The bits in the Status Register are sticky and do

not automatically return to ‘0’ when a new Program

or Erase command is issued. If an error occurs

then it is essential to clear any error bits in the Sta-

tus Register by issuing the Clear Status Register

command before attempting a new Program or

Erase command.

Program/Erase Suspend Command. The

Pro-

gram/Erase Suspend command can be used to

pause a Program or Block Erase operation. One

Bus Write cycle is required to issue the Program/

Erase Suspend command and pause the Pro-

gram/Erase Controller. Once the command is is-

sued it is necessary to poll the Program/Erase

Controller Status bit to find out when the Program/

Erase Controller has paused; no other commands

will be accepted until the Program/Erase Control-

ler has paused. After the Program/Erase Control-

ler has paused, the memory will continue to output

the Status Register until another command is is-

sued.

During the polling period between issuing the Pro-

gram/Erase Suspend command and the Program/

Erase Controller pausing it is possible for the op-

eration to complete. Once Program/Erase Control-

ler Status bit indicates that the Program/Erase

Controller is no longer active, the Program Sus-

pend Status bit or the Erase Suspend Status bit

can be used to determine if the operation has com-

pleted or is suspended. For timing on the delay be-

tween

issuing

the

Program/Erase

Suspend

command and the Program/Erase Controller

pausing see Table 15..

During Program/Erase Suspend the Read Memo-

ry Array, Read Status Register, Read Electronic

Signature and Program/Erase Resume com-

mands will be accepted by the Command Inter-

face. Additionally, if the suspended operation was

Block Erase then the Program command will also

be accepted; only the blocks not being erased may

be read or programmed correctly.

See Figure 19. and Figure 22. for suggested flow-

charts on using the Program/Erase Suspend com-

mand.

Program/Erase Resume Command. The

Pro-

gram/Erase Resume command can be used to re-

start

the

Program/Erase

Controller

after

Program/Erase Suspend has paused it. One Bus

Write cycle is required to issue the Program/Erase

Resume command. Once the command is issued

subsequent Bus Read operations read the Status

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