TW241348B - Built-in protecting device - Google Patents
Built-in protecting deviceInfo
- Publication number
- TW241348B TW241348B TW83105700A TW83105700A TW241348B TW 241348 B TW241348 B TW 241348B TW 83105700 A TW83105700 A TW 83105700A TW 83105700 A TW83105700 A TW 83105700A TW 241348 B TW241348 B TW 241348B
- Authority
- TW
- Taiwan
- Prior art keywords
- program
- built
- memory
- cpu
- software
- Prior art date
Links
Abstract
A built-in protecting device for the program in IC in digital electric system which consists of one CPU, one address transforming device, one memory controller and one memory for storing system program, includes: 1. one mode set-up device for controlling the execution mode of the built-in program, which includes one software switch controlled by software; 2. one protection program memory for storing built-in protection program. It features: 1. the software is switched into the first state when the electric system is started up, making the mode set-up device enter on execution mode of the built-in program, and the address transforming device points the output address decode of the CPU to the protection program memory to make the system execute the protection program; 2. when the protection program is executed over, the software switch is switched to the second state and kept in it permanently, making the mode set-up device enter into one hidden mode of the built-in program, and the address transforming device points the output address decode of the CPU to the memory stored with system program to make the system execute the system program.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW83105700A TW241348B (en) | 1994-06-23 | 1994-06-23 | Built-in protecting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW83105700A TW241348B (en) | 1994-06-23 | 1994-06-23 | Built-in protecting device |
Publications (1)
Publication Number | Publication Date |
---|---|
TW241348B true TW241348B (en) | 1995-02-21 |
Family
ID=51400912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW83105700A TW241348B (en) | 1994-06-23 | 1994-06-23 | Built-in protecting device |
Country Status (1)
Country | Link |
---|---|
TW (1) | TW241348B (en) |
-
1994
- 1994-06-23 TW TW83105700A patent/TW241348B/en not_active IP Right Cessation
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MK4A | Expiration of patent term of an invention patent |