AT89S52-24AC View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89S52-24AC

8-bit Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

AT89S52

22. Programming Interface – Parallel Mode

Every code byte in the Flash array can be programmed by using the appropriate combination of

control signals. The write operation cycle is self-timed and once initiated, will automatically time

itself to completion.

Most major worldwide programming vendors offer support for the Atmel AT89 microcontroller

series. Please contact your local programming vendor for the appropriate software revision.

Table 22-1. Flash Programming Modes

ALE/

Mode

VCC RST PSEN PROG

(2)

Write Code Data

5V

H

L

EA/

VPP

12V

P2.6 P2.7 P3.3 P3.6 P3.7

L

H

H

H

H

Read Code Data 5V

H

L

Write Lock Bit 1

5V

H

L

Write Lock Bit 2

5V

H

L

Write Lock Bit 3

5V

H

L

H

H

L

L

L

H

H

(3)

12V

H

H

H

H

H

(3)

12V

H

H

H

L

L

(3)

12V

H

L

H

H

L

Read Lock Bits

5V

H

L

1, 2, 3

Chip Erase

5V

H

L

H

H

H

H

L

H

L

(1)

12V

H

L

H

L

L

Read Atmel ID

5V

H

L

H

H

L

L

L

L

L

Read Device ID

5V

H

L

H

H

L

L

L

L

L

Read Device ID

5V

H

L

H

H

L

L

L

L

L

Notes:

1. Each PROG pulse is 200 ns - 500 ns for Chip Erase.

2. Each PROG pulse is 200 ns - 500 ns for Write Code Data.

3. Each PROG pulse is 200 ns - 500 ns for Write Lock Bits.

4. RDY/BSY signal is output on P3.0 during programming.

5. X = don’t care.

P0.7-0

Data

DIN

DOUT

X

X

X

P0.2,

P0.3,

P0.4

X

1EH

52H

06H

P2.4-0 P1.7-0

Address

A12-8

A7-0

A12-8

A7-0

X

X

X

X

X

X

X

X

X

X

X 0000

00H

X 0001

00H

X 0010

00H

23

1919C–MICRO–3/05

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