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參數(shù)資料
| 型號： | AP87C54-20 |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER WITH 16 KBYTES USER PROGRAMMABLE EPROM |
| 中文描述： | 8-BIT, OTPROM, 20 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大小： | 290K |
| 代理商： | AP87C54-20 |
AUTOMOTIVE 87C54/87C54-20
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/V
PP
from V
CC
to 12.75V
g
0.25V.
5. Pulse ALE/PROG 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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