GMS81C2112 Datasheet, PDF (89/107 Pages) Hynix Semiconductor – HYNIX SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C2112/GMS81C2120
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 (7030_H ~ 703F_H) 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.
7030_H
DEVICE
CONFIGURATION
AREA
703F_H
ID
ID
ID
ID
ID
ID
ID
ID
ID
ID
ID
ID
ID
ID
ID
CONFIG
7030_H
7031_H
7032_H
7033_H
7034_H
7035_H
7036_H
7037_H
7038_H
7039_H
703A_H
703B_H
703C_H
703D_H
703E_H
703F_H
7
6
5
4
3
2
1
0
CONFIG
PFS1 PFS0
LOCK
RCO
ADDRESS: 703F_H
INITIAL VALUE: --00 -0-0_B
External RC OSC Selection
0: Crystal or Resonator Oscillator
1: External RC Oscillator
Code Protect
0 : Allow Code Read Out
1 : Lock Code Read Out
PFD Level Selection
00: PFD = 2.7V
01: PFD = 2.7V
10: PFD = 3.0V
11: PFD = 2.4V
Figure 21-1 Device Configuration Area
JUNE. 2001 Ver 1.00
83