AT89C52-24PC datasheet(14/24 Pages) ATMEL

14 / 24 page

AT89C52

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) = 52H indicates 89C52

(032H) = FFH indicates 12V programming

(032H) = 05H indicates 5V 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.

Note:

1. Chip Erase requires a 10 ms PROG pulse.

Flash Programming Modes

Mode

RST

PSEN

ALE/PROG

EA/V

P2.6

P2.7

P3.6

P3.7

Write Code Data

H/12V

Read Code Data

Write Lock

Bit - 1

H/12V

Bit - 2

H/12V

Bit - 3

H/12V

Chip Erase

H/12V

Read Signature Byte

(1)

AT89C52-24PC Datasheet(PDF) 14 Page - ATMEL Corporation

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