87C51RA 查看數據表（PDF） - Intel

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87C51RA

CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

Intel 

8XC51RA RB RC

Program Lock Bits

LB1 LB2 LB3

1U

U

U

2P

U

U

3P

P

U

4P

P

P

Table 5 Program Lock Bits and the Features

Protection Type

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

Encryption Array if programmed )

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 EPROM is disabled

Same as 2 also verify is disabled

Same as 3 also external execution is disabled

NOTE

Any other combination of the lock bits is not defined

EPROM PROGRAMMING AND VERIFICATION CHARACTERISTICS

(TA e 21 C to 27 C VCC e 5V g20% VSS e 0V)

Symbol

Parameter

Min

Max

VPP

Programming Supply Voltage

12 5

13 0

IPP

Programming Supply Current

75

1 TCLCL

Oscillator Frequency

4

6

TAVGL

Address Setup to PROG Low

48TCLCL

TGHAX

Address Hold after PROG

48TCLCL

TDVGL

Data Setup to PROG Low

48TCLCL

TGHDX

Data Hold after PROG

48TCLCL

TEHSH

TSHGL

TGHSL

TGLGH

(Enable) High to VPP

VPP Setup to PROG Low

VPP Hold after PROG

PROG Width

48TCLCL

10

10

90

110

TAVQV

Address to Data Valid

48TCLCL

TELQV

ENABLE Low to Data Valid

48TCLCL

TEHQZ

Data Float after ENABLE

0

48TCLCL

TGHGL

PROG High to PROG Low

10

Units

V

mA

MHz

ms

ms

ms

ms

19

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