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P89C51RB2BA датащи(PDF) 47 Page - NXP Semiconductors

номер детали P89C51RB2BA
подробное описание детали  80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM
PDF  52 Pages
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

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Philips Semiconductors
Preliminary specification
89C51RB2/89C51RC2/
89C51RD2
80C51 8-bit Flash microcontroller family
16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM
1999 Sep 23
47
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 89C51RB2/RC2/RD2 has 3 programmable
security lock bits that will provide different levels of protection for the
on-chip code and data (see Table 10).
Table 10.
SECURITY LOCK BITS1
PROTECTION DESCRIPTION
LB1
LB2
LB3
PROTECTION DESCRIPTION
X
X
X
MOVC instructions executed from external program memory are disabled from fetching code bytes
from internal memory.
1
X
X
Block erase is disabled. Erase or programming of the status byte or boot vector is disabled.
X
1
X
Verify of code memory is disabled.
X
X
1
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.



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