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參數(shù)資料
| 型號： | MD80C51 |
| 廠商： | Intel Corp. |
| 英文描述： | CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER |
| 中文描述： | CHMOS單片8位微控制器 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 229K |
| 代理商： | MD80C51 |
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 ‘‘Pgm Encryption 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 V
PP
level for any
amount of time. Even a narrow glitch above that volt-
age level can cause permanent damage to the de-
vice. The V
PP
source should be well regulated and
free of glitches and overshoot.
270419–21
Figure 13. Program Verification
14
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| MD80C51BH | 制造商:ROCHESTER 制造商全稱:ROCHESTER 功能描述:CMOS SINGLE - CHIP 8-BIT MICROCOMPUTER 64K program Memory Space |
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| MD80C862 | 制造商:Intel 功能描述:PROCESSOR:MICRO-PROCESSOR |
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