87C51F Intel Corporation, 87C51F Datasheet - Page 15

• Manufacturer Part Number: 87C51F
• Description: CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
• Manufacturer: Intel Corporation

PROGRAMMING ALGORITHM
Refer to Table 3 and Figures 11 and 12 for address
data and control signals set up To program the
87C51FA FB FC 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-
4 Raise EA V
5 Pulse ALE PROG 5 times for the EPROM array
nals
and 25 times for the encryption table and the lock
bits
See Table 2 for proper input on these pins
PP
from V
CC
to 12 75V
Figure 12 Programming Signal’s Waveforms
Figure 11 Programming the EPROM
g
0 25V
5 Pulses
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 87C51FA FB FC
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
AUTOMOTIVE 87C51FA FB FC FC-20
270961 –19
270961 – 20
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