參數(shù)資料
型號(hào)： 935267811551
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQFP44
封裝： PLASTIC, QFP-44
文件頁(yè)數(shù)： 43/52頁(yè)
文件大?。?/td> 288K
代理商： 935267811551
Philips Semiconductors
Preliminary data
P89C51RB2/P89C51RC2/
P89C51RD2
80C51 8-bit Flash microcontroller family
16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM
2001 Jun 27
48
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 P89C51RB2/RC2/RD2 has three 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
LEVEL
LB1
LB2
LB3
PROTECTION DESCRIPTION
1
0
MOVC instructions executed from external program memory are disabled from fetching code
bytes from internal memory.
2
1
0
Block erase is disabled. Erase or programming of the status byte or boot vector is disabled.
3
1
0
Verify of code memory is disabled.
4
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.
相關(guān)PDF資料
PDF描述
935265437112 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PDIP40
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