GMS87C1102 datasheet(67/80 Pages) HYNIX

67 / 80 page

HYUNDAI MicroElectronics

GMS87C1102 / GMS87C1202

Oct. 1999 ver 1.0

23. OTP PROGRAMMING

The GMS87C1102/1202T is one-time PROM(OTP) microcontroller with 2K bytes electrically programmable read only

memory for the GMS87C1102/1202 system evaluation, first production and fast mass production.

To programming the OTP device, user must use the universal programmer which is support HYUNDAI MicroElectronics

microcontrollers.

23.1 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 1-1.

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.

Figure 23-1 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.

DEVICE

0F50H

0FF0H

CONFIG

CONFIGURATION

AREA

0F60H

0F70H

0F80H

0F90H

0FA0H

0FB0H

0FC0H

0FD0H

0FE0H

Configuration Register

CONFIG

ADDRESS : 0FF0H

LOCK

0 : Allow Code Read Out

1 : Prohibit Code Read Out

SECURITY BIT

0 : Normal Oscillator

1 : External RC Oscillator

RC Option

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