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P89C51RC2FA/01 bảng dữ liệu(PDF) 54 Page - NXP Semiconductors

tên linh kiện P89C51RC2FA/01
Giải thích chi tiết về linh kiện  80C51 8-bit Flash microcontroller family
PDF  68 Pages
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nhà sản xuất  PHILIPS [NXP Semiconductors]
Trang chủ  http://www.nxp.com
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Philips Semiconductors
Preliminary data
P89C51RA2/RB2/RC2/RD2xx
80C51 8-bit Flash microcontroller family
8KB/16KB/32KB/64KB ISP/IAP Flash with 512B/512B/512B/1KB RAM
2002 Jul 18
54
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 P89C51RA2/RB2/RC2/RD2xx has three programmable security lock bits that will provide different levels of protection for the
on-chip code and data (see Table 11).
Table 11.
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
Block erase is disabled. Erase or programming of the status byte or boot vector is disabled.
3
1
1
0
Verify of code memory is disabled.
4
1
1
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.
2. Any other combination of lock bits is undefined.
3. Setting LBx doesn’t prevent programming of unprogrammed bits.



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