AT89LV52 データシートの表示（PDF） - Atmel Corporation

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AT89LV52

8-Bit Microcontroller with 8K Bytes Flash

Atmel Corporation 

Not

Ready/Busy: The progress of byte programming can also

be monitored by the RDY/BSY output signal. P3.4 is pulled

low after ALE goes high during programming to indicate

BUSY. P3.4 is pulled high again when programming is

done to indicate READY.

Program Verify: If lock bits LB1 and LB2 have not been

programmed, the programmed code data can be read back

via the address and data lines for verification. The lock bits

cannot be verified directly. Verification of the lock bits is

achieved by observing that their features are enabled.

Chip Erase: The entire Flash array is erased electrically

by using the proper combination of control signals and by

holding ALE/PROG low for 10 ms. The code array is written

with all 1s. The chip erase operation must be executed

before the code memory can be reprogrammed.

Reading the Signature Bytes: The signature bytes are

read by the same procedure as a normal verification of

locations 030H, 031H, and 032H, except that P3.6 and

P3.7 must be pulled to a logic low. The values returned are

as follows:

(030H) = 1EH indicates manufactured by Atmel

(031H) = 62H indicates 89LV52

(032H) = FFH indicates 12V programming

Programming Interface

Every code byte in the Flash array can be written, and the

entire array can be erased, by using the appropriate combi-

nation of control signals. The write operation cycle is self-

timed and once initiated, will automatically time itself to

completion.

All major programming vendors offer worldwide support for

the Atmel microcontroller series. Please contact your local

programming vendor for the appropriate software revision.

Flash Programming Modes

Mode

Write Code Data

RST

H

PSEN

L

ALE/PROG

EA/VPP

12V

P2.6

L

P2.7

H

P3.6

H

P3.7

H

Read Code Data

H

L

Write Lock

Bit - 1

H

L

H

H

L

L

H

H

12V

H

H

H

H

Bit - 2

H

L

12V

H

H

L

L

Bit - 3

H

L

12V

H

L

H

L

Chip Erase

H

L

(1)

12V

H

L

L

L

Read Signature Byte

H

L

H

Note: 1. Chip Erase requires a 10-ms PROG pulse.

H

L

L

L

L

4-95

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