BN87C54 datasheet(17/20 Pages) INTEL

Part #	BN87C54

Description	CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER WITH 16 KBYTES USER PROGRAMMABLE EPROM

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Manufacturer	INTEL [Intel Corporation]

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AUTOMOTIVE 87C5487C54-20

PROGRAMMING ALGORITHM

Refer to Table 3 and Figures 11 and 14 for address

data and control signals set up To program the

87C54 the following sequence must be exercised

1 Input the valid address on the address lines

2 Input the appropriate data byte on the data

lines

3 Activate the correct combination of control sig-

nals

4 Raise EA VPP from VCC to 1275V g025V

5 Pulse ALEPROG 5 times for the EPROM ar-

ray and 25 times for the encryption table and

the lock bits

Repeat 1 through 5 changing the address and data

for the entire array or until the end of the object file is

reached

PROGRAM VERIFY

Program verify may be done after each byte or block

of bytes is programmed In either case a complete

verify of programmed array will ensure reliable pro-

gramming of the 87C54

The lock bits cannot be directly verified Verification

of the lock bits is done by observing that their fea-

tures are enabled Refer to the EPROM Program

Lock section in this data sheet

270849 – 25

5 Pulses

Figure 14 Programming Signal’s Waveforms

17

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