TP7C51BH datasheet(13/16 Pages) INTEL

13 / 16 page

AUTOMOTIVE 80C31BH80C51BH87C51

EPROM CHARACTERISTICS

(EPROM Only)

The 87C51 is programmed by a modified Quick-

Pulse Programming algorithm It differs from older

methods in the value used for VPP (Programming

Supply Voltage) and in the width and number of the

ALEPROG pulses

The 87C51 contains two signature bytes that can be

read and used by an EPROM programming system

to identify the device The signature bytes identify

the device as an 87C51 manufactured by Intel

Table 3 shows the logic levels for reading the signa-

ture byte and for programming the Program Memo-

ry the Encryption Table and the Lock Bits The cir-

cuit configuration and waveforms for Quick-Pulse

Programming are shown in Figures 11 and 12 Fig-

ure 13 shows the circuit configuration for normal

Program Memory verification

Table 3 EPROM Programming Modes

MODE

RST

PSEN

ALE

P27

P26

P37

P36

PROG

VPP

Read Signature

Program Code Data

VPP

1011

Verify Code Data

Pgm Encryption Table

VPP

1010

Pgm Lock Bit 1

VPP

1111

Pgm Lock Bit 2

VPP

1100

NOTES

‘‘1’’ e Valid high for that pin

‘‘0’’ e Valid low for that pin

VPP e 1275V g 025V

VCC e 5V g20% during programming and verification

ALEPROG receives 25 programming pulses while VPP is held at 1275V Each programming pulse is low for 100 ms

(g10 ms) and high for a minimum of 10 ms

270419 – 19

Figure 11 Programming Configuration

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