24

2601B–MICRO–03/05

AT89LS52

20. 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 worldwide support for the Atmel 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 20-1.

Flash Programming Modes

Mode

V

CC

RST

PSEN

ALE/

PROG

EA/

V

PP

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

D

IN

A12-8

A7-0

Read Code Data

5V

H

L

H

H

L

L

L

H

H

A12-8

A7-0

Write Lock Bit 1

5V

H

L

(3)

12V

HHHHH

X

X

X

Write Lock Bit 2

5V

H

L

(3)

12V

H

H

H

L

L

X

X

X

Write Lock Bit 3

5V

H

L

(3)

12V

H

L

H

H

L

X

X

X

Read Lock Bits

1, 2, 3

5V

H

L

H

H

H

H

L

H

L

P0.2,

P0.3,

P0.4

XX

Chip Erase

5V

H

L

(1)

12V

HL

HL

L

X

X

X

Read Atmel ID

5V

H

L

H

H

LLLLL

1EH

X 0000

00H

Read Device ID

5V

H

L

H

H

LLLLL

62H

X 0001

00H

Read Device ID

5V

H

L

H

H

LLLLL

06H

X 0010

00H