AT89S52-24AC datasheet(23/39 Pages) ATMEL

Part #	AT89S52-24AC

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

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Manufacturer	ATMEL [ATMEL Corporation]

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23

1919C–MICRO–3/05

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.

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.

Table 22-1.

Flash Programming Modes

Mode

VCC

RST

PSEN

ALE/

PROG

EA/

VPP

P2.6

P2.7

P3.3

P3.6

P3.7

P0.7-0

Data

P2.4-0

P1.7-0

Address

Write Code Data

5V

H

L

(2)

12V

L

HHHH

DIN

A12-8

A7-0

Read Code Data

5V

H

L

H

L

H

D

OUT

A12-8

A7-0

Write Lock Bit 1

5V

H

L

(3)

12V

HHHHH

X

Write Lock Bit 2

5V

H

L

(3)

12V

H

L

X

Write Lock Bit 3

5V

H

L

(3)

12V

H

L

H

L

X

Read Lock Bits

1, 2, 3

5V

H

L

H

L

H

L

P0.2,

P0.3,

P0.4

XX

Chip Erase

5V

H

L

(1)

12V

HL

L

X

Read Atmel ID

5V

H

L

H

LLLLL

1EH

X 0000

00H

Read Device ID

5V

H

L

H

LLLLL

52H

X 0001

00H

Read Device ID

5V

H

L

H

LLLLL

06H

X 0010

00H

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AT89S52-24AC Datasheet(PDF) 23 Page - ATMEL Corporation

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