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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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P89C668 датащи(PDF) 74 Page - NXP Semiconductors |
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P89C668 датащи(HTML) 74 Page - NXP Semiconductors |
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74 / 89 page  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 BITS1 PROTECTION DESCRIPTION Level LB1 LB2 LB3 PROTECTION DESCRIPTION 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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