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AT87F51

8-Bit Microcontroller with 4K Bytes QuickFlash™

Atmel Corporation 

Programming Interface

Every code byte in the QuickFlash array can be pro-

grammed by using the appropriate combination of control

signals. The write operation cycle is self-timed and once

initiated, will automatically time itself to completion.

All major programming vendors offer worldwide support for

the Atmel microcontroller series. Please contact your local

programming vendor for the appropriate software revision.

QuickFlash Programming Modes

Mode

Write Code Data

RST

H

PSEN

L

ALE/PROG

EA/VPP

12V

P2.6

L

P2.7

H

P3.6

H

P3.7

H

Read Code Data

H

L

Write Lock

Bit - 1

H

L

H

H

L

L

H

H

12V

H

H

H

H

Bit - 2

H

L

12V

H

H

L

L

Bit - 3

H

L

12V

H

L

H

L

Read Signature Byte

H

L

Figure 3. Programming the QuickFlash Memory

ADDR. A0 - A7

OOOOH/OFFFH

A8 - A11

AT87F51

P1

VCC

P2.0 - P2.3 P0

P2.6

SEE FLASH

PROGRAMMING

MODES TABLE

P2.7

ALE

P3.6

P3.7

XTAL2

EA

+5V

PGM

DATA

PROG

VIH/VPP

3-24 MHz

H

H

L

L

L

L

Figure 4. Verifying the QuickFlash Memory

AT87F51

ADDR. A0 - A7 P1

VCC

OOOOH/0FFFH

P2.0 - P2.3 P0

A8 - A11

P2.6

SEE FLASH

PROGRAMMING

MODES TABLE

P2.7

ALE

P3.6

P3.7

XTAL2

EA

+5V

PGM DATA

(USE 10K

PULLUPS)

VIH

3-24 MHz

XTAL1

RST

VIH

GND

PSEN

XTAL1

RST

VIH

GND

PSEN

6

Not

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