AT89LS51-16SC View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89LS51-16SC

8-bit Low-Voltage Microcontroller with 4K Bytes In-System Programmable Flash

Atmel Corporation 

5. At the end of a programming session, RST can be set low to commence normal device

operation.

Power-off sequence (if needed):

1. Set XTAL1 to “L” (if a crystal is not used).

2. Set RST to “L”.

3. Turn VCC power off.

Data Polling: The Data Polling feature is also available in the serial mode. In this mode, during

a write cycle an attempted read of the last byte written will result in the complement of the MSB

of the serial output byte on MISO.

16.2 Serial Programming Instruction Set

The Instruction Set for Serial Programming follows a 4-byte protocol and is shown in Table 19-1.

17. 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 microcontroller series.

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

Table 17-1. 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

61H

06H

P2.3-0 P1.7-0

Address

A11-8

A7-0

A11-8

A7-0

X

X

X

X

X

X

X

X

X

X

0000

00H

0001

00H

0010

00H

16 AT89LS51

3053B–MICRO–3/05

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