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

23 / 39 page

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

(2)

12V

HHHH

DIN

A12-8

A7-0

Read Code Data

OUT

A12-8

A7-0

Write Lock Bit 1

(3)

12V

HHHHH

Write Lock Bit 2

(3)

12V

Write Lock Bit 3

(3)

12V

Read Lock Bits

1, 2, 3

P0.2,

P0.3,

P0.4

Chip Erase

(1)

12V

Read Atmel ID

LLLLL

1EH

X 0000

00H

Read Device ID

LLLLL

52H

X 0001

00H

Read Device ID

LLLLL

06H

X 0010

00H

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

AT89S52-24AI Datasheet(HTML) 23 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

Datasheet Download

Link URL