TN80L51FA 查看數據表（PDF） - Intel

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TN80L51FA

LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS

Intel 

8XL51FA FB FC

Table 4 Program Lock Bits and the Features

Program Lock Bits

LB1 LB2 LB3

ProtectIon Type

1 U U U No Program Lock features enabled (Code verify will still be encrypted by the

Encryption Array if programmed )

2P

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

3P

P

U Same as 2 also verify is disabled

4P

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

30H

31H

60H

Device

All

All

83L51FA

87L51FA

83L51FB

87L51FB

83L51FC

87L51FC

Contents

89H

58H

70H

F0H

71H

F1H

72H

F2H

18

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