M28F201 datasheet(9/21 Pages) STMICROELECTRONICS

9 / 21 page

AI00644

tWHGL

tVPHEL

00000h-00001h

tELQV

tEHQZ

tAVQV

A0-A17

DQ0-DQ7

DATA OUT

COMMAND

VPP

tAXQX

tGHQZ

tGLQV

READ

MANUFACTURER

OR DEVICE

READ ELECTRONIC

SIGNATURE SET-UP

tWLWH

tWHDX

tDVWH

tGHWL

tELWL

tWHEH

Figure 7. Electronic Signature Command Waveforms

Program and Program Verify Modes. The Pro-

gram Mode is set-up by writing 40h to the command

which latches the address and data of the byte to

be programmed. The rising edge of W during this

second cycle starts the programming operation.

Programming is followed by a Program Verify of the

data written.

Program Verify Mode is set-up by writing C0h to the

command register. The rising edge of W during the

set-up of the Program Verify Mode stops the Pro-

gramming operation. The following read cycle, of

the address already latched during programming,

is made with an internally generated margin volt-

age applied, reading valid data indicates that all bits

have been programmed.

Reset Mode. This command is used to safely abort

Erase or Program Modes. The Reset Mode is

set-up and performed by writing FFh two times to

the command register. The command should be

followed by writing a valid command to the the

command register (for example Read).

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