EN87C51FA1SF76 Ver la hoja de datos (PDF) - Atmel Corporation

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EN87C51FA1SF76

CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

Atmel Corporation 

87C51/80C51BH/80C31BH

PROGRAMMING THE 87C51

DEFINITION OF TERMS

The part must be running with a 4 MHz to 6 MHz

oscillator. The address of an EPROM location to be

programmed is applied to address lines while the

code byte to be programmed in that location is ap-

plied to data lines. Control and program signals must

be held at the levels indicated in Table 4. Normally

EA/V PP is held at logic high until just before

ALE/PROG is to be pulsed. The EA/V PP is raised to

VPP, ALE/PROG is pulsed low and then EA/V PP is

returned to a high (also refer to timing diagrams).

ADDRESS LINES: P1.0±P1.7, P2.0±P2.5, P3.4 re-

spectively for A0 ±A14.

DATA LINES: P0.0±P0.7 for D0±D7.

CONTROL SIGNALS: RST, PSEN, P2.6, P2.7, P3.3,

P3.6, P3.7.

PROGRAM SIGNALS: ALE/PROG , EA/V PP.

NOTE:

 Exceeding the VPP maximum for any amount of

time could damage the device permanently. The

VPP source must be well regulated and free of

glitches.

Table 4. EPROM Programming Modes

Mode

Program Code Data

RST

H

PSEN

L

ALE/

PROG

EA/

VPP

12.75V

P2.6

L

Verify Code Data

H

L

H

H

L

Program Encryption

Array Address 0 ±3F

H

L

12.75V L

Program Lock Bits Bit 1 H

L

12.75V H

Bit 2 H

L

12.75V H

Bit 3 H

L

12.75V H

Read Signature Byte

H

L

H

H

L

P2.7

H

L

H

H

H

L

L

P3.3

H

L

H

H

H

H

L

P3.6

H

H

L

H

L

H

L

P3.7

H

H

H

H

L

L

L

See Table 4 for proper input on these pins

Figure 10. Programming the EPROM

272335 ±21

17

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