TW241348B - Built-in protecting device - Google Patents

Built-in protecting device

Info

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
Application number
TW83105700A
Other languages
Chinese (zh)
Inventor
Zhang-San Chen
Original Assignee
United Microelectronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by United Microelectronics Corp filed Critical United Microelectronics Corp
Priority to TW83105700A priority Critical patent/TW241348B/en
Application granted granted Critical
Publication of TW241348B publication Critical patent/TW241348B/en

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.
TW83105700A 1994-06-23 1994-06-23 Built-in protecting device TW241348B (en)

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)

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Legal Events

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