87C54-20 Intel Corporation, 87C54-20 Datasheet - Page 17

• Manufacturer Part Number: 87C54-20
• Description: CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER WITH 16 KBYTES USER PROGRAMMABLE EPROM
• Manufacturer: Intel Corporation

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
Repeat 1 through 5 changing the address and data
for the entire array or until the end of the object file is
reached
1 Input the valid address on the address lines
2 Input the appropriate data byte on the data
3 Activate the correct combination of control sig-
4 Raise EA V
5 Pulse ALE PROG 5 times for the EPROM ar-
lines
nals
ray and 25 times for the encryption table and
the lock bits
PP
from V
CC
to 12 75V
Figure 14 Programming Signal’s Waveforms
g
0 25V
5 Pulses
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
AUTOMOTIVE 87C54 87C54-20
270849 –25
17