參數(shù)資料
型號: 89C52
廠商: NXP Semiconductors N.V.
英文描述: 80C51 8-bit microcontroller family8KFlash(80C51八位微控制器系列 8K閃速存儲器)
中文描述: 80C51的8位微控制器family8KFlash(80C51的八位微控制器系列8K的閃速存儲器)
文件頁數(shù): 27/32頁
文件大?。?/td> 212K
代理商: 89C52
Philips Semiconductors
Product specification
89C51/89C52/89C54/89C58
80C51 8-bit microcontroller family
4K/8K/16K/32K Flash
1999 Oct 27
27
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 89C51/89C52/89C54/89C58 has 3
programmable security lock bits that will provide different levels of
protection for the on-chip code and data (see Table 8). Unlike the
ROM and OTP versions, the security lock bits are independent. LB3
includes the security protection of LB1.
Table 8.
SECURITY LOCK BITS
1
PROTECTION DESCRIPTION
Level
LB1
MOVC instructions executed from external program memory are disabled from fetching code bytes from
internal memory.
LB2
Program verification is disabled
LB3
External execution is disabled.
NOTE:
1. The security lock bits are independent.
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