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BN87C51FB Datasheet(PDF) 15 Page - Intel Corporation

Part # BN87C51FB
Description  CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

BN87C51FB Datasheet(HTML) 15 Page - Intel Corporation

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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
15


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