GMS81C2020 Datasheet, PDF (84/92 Pages) Hynix Semiconductor – CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

GMS81C2020/GMS81C2120
Hyundai Micro Electro nics
24. OTP PROGRAMMING
24.1 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 designat-
ed 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
Configuration Register
CONFIG
SXB / R7 PFD1
-
PFD0
-
CODE
PROTECT
-
EXTERNAL
RCOSC
ADDRESS :703FH
PFD LEVEL SELECTION
0 0 : PFD1 = 2.7V
0 1 : PFD1 = 2.7V
1 0 : PFD2 = 3.0V
1 1 : PFD3 = 2.4V
SXB / R7
0 : SUB CLOCK
1 : R74, R75
EXTERNAL RCOSC
0 : Crystal Oscillator
1 : External RC Oscillator
CODE PROTECT
0 : ALLOW CODE READ OUT
1 : LOCK CODE READ OUT
Figure 24-1 Device Configuration Area
84
preliminary
Nov. 1999 Ver 0.0