參數(shù)資料
型號(hào)： 8XL51FC
英文描述： LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS
中文描述： 低壓CHMOS單片8位微控制器
文件頁數(shù)： 18/20頁
文件大?。?/td> 285K
代理商： 8XL51FC
8XL51FA/FB/FC
Table 4. Program Lock Bits and the Features
Program Lock Bits
ProtectIon Type
LB1
LB2
LB3
1
U
U
U
No Program Lock features enabled. (Code verify will still be encrypted by the
Encryption Array if programmed.)
2
P
U
U
MOVC instructions executed from external program memory are disabled from
fetching code bytes from internal memory, EA is sampled and latched on Reset,
and further programming of the OTP ROM is disabled.
3
P
P
U
Same as 2, also verify is disabled.
4
P
P
P
Same as 3, also external execution is disabled.
Any other combination of the lock bits is not defined.
Program Lock Bits
The 87L51FX has 3 programmable lock bits that
when programmed according to Table 4 will provide
different levels of protection for the on-chip code
and data.
Reading the Signature Bytes
The 87L51FX/83L51FX has 3 signature bytes in lo-
cations 30H, 31H, and 60H. To read these bytes fol-
low the procedure for OTP ROM verify, but activate
the control lines provided in Table 3 for Read Signa-
ture Byte.
Location
Device
Contents
30H
All
89H
31H
All
58H
60H
83L51FA
87L51FA
83L51FB
87L51FB
83L51FC
87L51FC
70H
F0H
71H
F1H
72H
F2H
18
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