GMS81C2012 datasheet(89/107 Pages) HYNIX

89 / 107 page

HYUNDAI MicroElectronics

GMS81C2012/GMS81C2020

MAR. 2000 Ver 1.00

21. OTP PROGRAMMING

21.1 DEVICE CONFIGURATION AREA

The Device Configuration Area can be programmed or left

unprogrammed to select device configuration such as secu-

rity bit.

Sixteen memory locations (7030H ~ 703FH) are designated

as Customer ID recording locations where the user can

store check-sum or other customer identification numbers.

This area is not accessible during normal execution but is

readable and writable during program / verify.

Figure 21-1 Device Configuration Area

DEVICE

7030H

703FH

CONFIG

CONFIGURATION

AREA

7031H

7032H

7033H

7034H

7035H

7036H

7037H

7038H

7039H

703AH

703BH

703CH

703DH

703EH

6543210

RCO

INITIAL VALUE: -000 -0-0B

ADDRESS: 703FH

CONFIG

LOCK

Code Protect

0 : Allow Code Read Out

1 : Lock Code Read Out

PFD Level Selection

00: PFD = 2.7V

01: PFD = 2.7V

External RC OSC Selection

0: Crystal or Resonator Oscillator

1: External RC Oscillator

PFS0

PFS1

R7X

10: PFD = 3.0V

11: PFD = 2.4V

R74, R75 Port Selection

0 : Sub Clock

1 : R74, R75

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