TP87C51FC datasheet(15/18 Pages) INTEL

15 / 18 page

AUTOMOTIVE 87C51FAFBFCFC-20

270961 – 19

See Table 2 for proper input on these pins

Figure 11 Programming the EPROM

PROGRAMMING ALGORITHM

Refer to Table 3 and Figures 11 and 12 for address

data and control signals set up To program the

87C51FAFBFC 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 array

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 the programmed array will ensure reliable

programming of the 87C51FAFBFC

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

270961 – 20

5 Pulses

Figure 12 Programming Signal’s Waveforms

TP87C51FC Datasheet(PDF) 15 Page - Intel Corporation