81C51SL-AL View Datasheet(PDF) - Intel

Part Name

Description

Manufacturer

81C51SL-AL

8XC51SL/LOW VOLTAGE 8XC51SL KEYBOARD CONTROLLER

Intel 

8XC51SL LOW VOLTAGE 8XC51SL

PROGRAMMING THE OTP

The part must be running with a 4 MHz to 6 MHz

oscillator The address of a location to be pro-

grammed is applied to address lines while the code

byte to be programmed in that location is applied to

data lines Control and program signals must be held

at the levels indicated in Table 4 Normally EAL VPP

is held at a logic high until just before RCL PROGL

is to be pulsed The EAL VPP is raised to VPP

RCL PROGL is pulsed low and then EAL VPP is re-

turned to VCC (also refer to timing diagrams) Also

the LOADREN signal must be grounded when pro-

gramming or verifying

NOTE

Exceeding the VPP maximum for any amount of

time could damage the device permanently The

VPP source must be well regulated and free of

glitches

DEFINITION OF TERMS

ADDRESS LINES P10 – P17 P20– P25 respective-

ly for A0– A13

DATA LINES

ADB0– 7

CONTROL SIGNALS RST GATEA20 P26 P27

P32 P36 P37

PROGRAM SIGNALS RCL PROGL EAL VPP

PROGRAMMING ALGORITHM

Refer to Table 4 and Figures 8 and 9 for address

data and control signals setup To program the

87C51SL the following sequence must be exercised

1 Input the valid address on the address lines

2 Input the appropriate data byte on the data lines

3 Activate the correct combination of control sig-

nals

4 Raise EAL VPP from VCC to 12 75V g0 25V

5 Pulse RCL PROGL 5 times

Repeat 1 through 5 changing the address and data

for the entire array or until the end of the object file is

reached

Table 4 OTP Programming Modes

Mode

RST

GATEA20

RCL

PROGL

EAL VPP

P26

P27

P32

P36

P37

Program Code Data

H

L

12 75V

L

H

H

H

H

Verify Code Data

H

L

H

H

L

L

L

H

H

Read Signature Byte H

L

H

H

L

L

L

L

L

Note that in the above table to program code data

on the Low Voltage 87C51SL VCC must be raised to

5V g10% In addition all address lines data lines

and control signals being driven to a ‘‘High’’ level

must be raised to 5V g10% The RCL PROGL sig-

nal must pulse between 0V and 5V g10%

To verify code data or read the signature bytes of

the Low Voltage 87C51SL VCC must be set to 3 3V

g0 3V In addition all address lines and control sig-

nals being driven to a ‘‘High’’ level must be raised to

3 3V g0 3V

For the standard (5V version) of the 87C51SL VCC

must always be at 5V g10% and all ‘‘High’’ volt-

ages must meet the DC specs indicated in the DC

Characteristics section of this document

18

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