Rainbow-electronics AT89LS51 Manual de usuario descargar pdf (Pagina 14)

AT89LS51

3053A–8051–05/02

Power-off sequence (if needed):

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

Set RST to “L”.

Turn V

power off.

Data

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

ing 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.

Serial

Programming

Instruction Set

The Instruction Set for Serial Programming follows a 4-byte protocol and is shown in Table 8.

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.

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 7 . Flash Programming Modes

Mode V

RST PSEN

ALE/

PROG

EA/

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

P0.7-0

Data

P2.3-0 P1.7-0

Address

WriteCodeData 5V H L

(2)

12VL HHHH D

A11-8 A7-0

Read Code Data 5V H L H H L L L H H D

OUT

A11-8 A7-0

Write Lock Bit 1 5V H L

(3)

12VHHHHH 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

Chip Erase 5V H L

(1)

12V H L H L L X X X

ReadAtmelID 5VH L H H LLLLL 1EH000000H

ReadDeviceID5VH L H H LLLLL 61H 000100H

ReadDeviceID5VH L H H LLLLL 06H 001000H

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 28 29

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Rainbow-electronics AT89LS51 Manual de usuario Pagina 14

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