JPS63103152U - - Google Patents
Info
- Publication number
- JPS63103152U JPS63103152U JP1986202681U JP20268186U JPS63103152U JP S63103152 U JPS63103152 U JP S63103152U JP 1986202681 U JP1986202681 U JP 1986202681U JP 20268186 U JP20268186 U JP 20268186U JP S63103152 U JPS63103152 U JP S63103152U
- Authority
- JP
- Japan
- Prior art keywords
- contents
- program memory
- pair
- proms
- microcomputer
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Landscapes
- Storage Device Security (AREA)
Description
第１図は本考案の実施例１のブロツク図で１チ
ツプマイコンのブロツクの１部を示し、第２図は
実施例２のブロツク図である。
１……一対のＰＲＯＭの一方、２……一対のＰ
Ｒ―ＯＭの他方、３……比較回路、４……データ
バス、５……読み出し制御信号、６……書き込み
制御回路、７……プログラムメモリ、８……アド
レスパス、９……アドレスデコーダ、１０……書
き込み制御回路。
FIG. 1 is a block diagram of a first embodiment of the present invention, showing part of a block of a one-chip microcomputer, and FIG. 2 is a block diagram of a second embodiment of the present invention. 1...one of a pair of PROMs, 2...a pair of P
The other side of R-OM, 3... Comparison circuit, 4... Data bus, 5... Read control signal, 6... Write control circuit, 7... Program memory, 8... Address path, 9... Address decoder, 10...Writing control circuit.
Claims (1)
コンピユータ用半導体デバイスにおいて、少なく
とも一対の電気的に書き込み可能なＰＲＯＭと該
Ｐ―ＲＯＭの内容を論理処理する回路を有し、該
一対のＰＲＯＭの内容が所定の値であるか否かに
よつてプログラムメモリ用ＲＯＭの内容の外部読
み出しを禁止できるマイクロコンピユータ。 A semiconductor device for a microcomputer with a built-in ROM for program memory, comprising at least a pair of electrically writable PROMs and a circuit for logically processing the contents of the P-ROMs, the contents of the pair of PROMs are set to a predetermined value. A microcomputer that can prohibit external reading of the contents of a program memory ROM depending on whether or not the program memory is read.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986202681U JPS63103152U (en) | 1986-12-23 | 1986-12-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986202681U JPS63103152U (en) | 1986-12-23 | 1986-12-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63103152U true JPS63103152U (en) | 1988-07-04 |
Family
ID=31167295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986202681U Pending JPS63103152U (en) | 1986-12-23 | 1986-12-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63103152U (en) |
-
1986
- 1986-12-23 JP JP1986202681U patent/JPS63103152U/ja active Pending
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