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參數(shù)資料
| 型號(hào)： | PC89C660 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 80C51 8-bit Flash microcontroller family |
| 中文描述： | 80C51的8位閃存微控制器系列 |
| 文件頁(yè)數(shù)： | 74/89頁(yè) |
| 文件大?。?/td> | 491K |
| 代理商： | PC89C660 |
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Philips Semiconductors
Product data
P89C660/P89C662/P89C664/
P89C668
80C51 8-bit Flash microcontroller family
16KB/32KB/64KB ISP/IAP Flash with 512B/1KB/2KB/8KB RAM
2002 Oct 28
74
Security
The security feature protects against software piracy and prevents the contents of the Flash from being read. The Security Lock bits are located
in Flash. The P89C660/662/664/668 has 3 programmable security lock bits that will provide different levels of protection for the on-chip code
and data (see Table 16).
Table 16.
SECURITY LOCK BITS
1
PROTECTION DESCRIPTION
Level
LB1
LB2
LB3
1
0
0
0
MOVC instructions executed from external program memory are disabled from fetching
code bytes from internal memory.
2
1
0
0
Same as level 1, plus block erase is disabled. Erase or programming of the status byte or
boot vector is disabled.
3
1
1
0
Same as level 2, plus verify of code memory is disabled.
4
1
1
1
Same as level 3, plus external execution is disabled.
NOTE:
1. Security bits are independent of each other. Full-chip erase may be performed regardless of the state of the security bits.
2. Any other combination of lockbits is undefined.
3. Setting LBx doesn’t prevent programming of unprogrammed bits.
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