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M58BF008

Table 6. Commands

Code

Command

02h

Overlay Block Erase Set-up

04h

Overlay Block Program Set-up

06h

Overlay Block Read Enable/

Disable

0Dh

Overlay Block Erase Confirm

20h

Erase Set-up

30h

Wrap/No-wrap Burst Toggle

40h

Program Set-up

50h

Clear Status Register

60h

Asynchronous/Synchronous

Read Toggle

70h

Read Status Register

90h

Read Electronic Signature

B0h

Program/Erase Suspend

D0h

Program/Erase Resume or

Erase Confirm

FFh

Read Memory Array

INSTRUCTIONS AND COMMANDS

The Instructions are listed in Tables 6 and 7. They

may be broadly divided into two types, those that

access or modify the memory content and those

that toggle a mode or function.

The Instructions that access or modify the memory

content include:

– Read Memory Array (RD)

– Read Status Register (RSR) and Clear Status

– Read Electronic Signature (RSIG)

– Erase (EE) and Overlay Block Erase (OBEE)

– Program (PG) and Overlay Block Program (OB-

PG)

– Program or Erase Suspend (PES) and Program

or Erase Resume (PER)

The Instructions that toggle a mode or function in-

clude:

– Asynchronous/Synchronous Read mode Tog-

gle (ART)

– Wrap/No-wrap Burst mode Toggle (WBT)

– Overlay Block Enable/Disable function Toggle

(OBT)

Instructions are written, in one or more write cy-

cles, to the memory Command Interface (C.I.) for

decoding. The Command Interface is reset to

Read Memory Array at power-up, when exiting

from power-down. Any invalid sequence of com-

mands will also reset the Command Interface to

Read Memory Array.

A Program/Erase Controller (P/E.C.) handles all

the timing and verifies the correct execution of the

Program or Erase instructions. The P/E.C. has a

Status Register which monitors the operations and

which may be read at any time during program or

erase. The Status Register bits indicate the oper-

ation and exit status of the internal algorithms.

The VPP Program and Erase Supply Voltage must

be within the range VPP1 or VPPH for programming

or erasure. If VPP out of range, the program or

erase algorithms do not start and Status Register

bit VPP Status VPPS will be set to ’1’.

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