GMS81C1102 / GMS81C1202
24. OTP PROGRAMMING
The GMS87C1102/1202 is one-time PROM(OTP) microcontroller with 2K bytes electrically programmable read only mem-
ory for the GMS81C1102/1202 system evaluation, first production and fast mass production.
To programming the OTP device, user must use the universal programmer which is support Hynix Semiconductor.
24.1 Program Memory MAP
Program Memory consists of configuration area and user program memory area. The configuration memory area has two
parts (User ID & System Configuration Bits), the areas are shown below in Figure 24-1.
The Device Configuration Area can be programmed or left unprogrammed to select device configuration such as security bit.
Ten memory locations (0F50H ~ 0FE0H) 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.
0F50H
ID
ID
0F50H
0F60H
0F70H
0F80H
0F90H
0FA0H
0FB0H
0FC0H
0FD0H
0FE0H
0FF0H
DEVICE
CONFIGURATION
AREA
ID
ID
0FF0H
ID
ID
ID
ID
ID
ID
CONFIG
Configuration Register
CONFIG
LOCK
RC
ADDRESS : 0FF0H
-
-
-
-
-
-
RC Option
0 : Normal Oscillator
1 : External RC Oscillator
SECURITY BIT
0 : Allow Code Read Out
1 : Prohibit Code Read Out
Figure 24-1 Device Configuration Area
The Security Definition Method is explained below.
1) After writing “H” to code protect bit in Write & Verify Mode and getting out of Write & Verify Mode, user cannot read
out the program code. But if not getting out of Write & Verify Mode (maintaining Programming Power VPP = 12.75V), user
can verify Program code.
2) Regardless of Code protect, user can read out configuration Memory (User ID and Configuration Bits)
3) If user knows Security (Lock) state, user can read code protect bit in the System Configuration Bits.
Jan. 2002 ver 2.0
71
HYNIX [ HYNIX SEMICONDUCTOR ]
