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參數(shù)資料
| 型號： | BN87C51BH |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 842K |
| 代理商： | BN87C51BH |
AUTOMOTIVE 80C31BH/80C51BH/87C51
270419±20
Figure 12. PROG Waveforms
Quick-Pulse Programming
(EPROM Only)
The setup for Microcontroller Quick-Pulse Program-
ming is shown in Figure 11. Note that the 87C51 is
running with a 4 to 6 MHz oscillator. The reason the
oscillator needs to be running is that the device is
executing internal address and program data trans-
fers.
The address of the EPROM location to be pro-
grammed is applied to Ports 1 and 2, as shown in
Figure 11. The code byte to be programmed into
that location is applied to Port 0. RST, PSEN, and
pins of Ports 2 and 3 specified in Table 3 are held at
the ``Program Code Data'' levels indicated in Table
2. Then ALE/PROG is pulsed low 25 times as
shown in Figure 12.
To program the Encryption Table, repeat the 25-
pulse programming sequence for addresses 0
through 1FH, using the ``PgmEncryption Table'' lev-
els. Don't forget that after the Encryption Table is
programmed, verify cycles will produce only encrypt-
ed data.
To program the Lock Bits, repeat the 25-pulse pro-
gramming sequence using the ``Pgm Lock Bit'' lev-
els. After one Lock Bit is programmed, further pro-
gramming of the Code Memory and Encryption Ta-
ble is disabled. However, the other Lock Bit can still
be programmed.
Note that the EA/V PP pin must not be allowed to go
above the maximum specified VPP level for any
amount of time. Even a narrow glitch above that volt-
age level can cause permanent damage to the de-
vice. The VPP source should be well regulated and
free of glitches and overshoot.
270419±21
Figure 13. Program Verification
14
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