JPS62183255U - - Google Patents
Info
- Publication number
- JPS62183255U JPS62183255U JP6954886U JP6954886U JPS62183255U JP S62183255 U JPS62183255 U JP S62183255U JP 6954886 U JP6954886 U JP 6954886U JP 6954886 U JP6954886 U JP 6954886U JP S62183255 U JPS62183255 U JP S62183255U
- Authority
- JP
- Japan
- Prior art keywords
- instruction
- end signal
- execution end
- outputs
- signal
- 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
- 238000010586 diagram Methods 0.000 description 1
Description
第１図は本考案に従うマイクロプロセツサの構
成を示すブロツク図である。
〔主な参照番号〕、１……内部リセツト信号、
２……プログラムカウンタ、３……命令コードバ
ス、４……マルチプレクサ、５……プログラムカ
ウンタ出力、６……マルチプレクサ出力、７……
マイクロプログラムＲＯＭ、８……実行終了信号
、９……実行開始信号、１０……命令実行制御回
路、１１……クロツクカウンタ出力、１２……ク
ロツクカウンタ、１３……内部クロツク信号、１
４……テストモード選択信号。
FIG. 1 is a block diagram showing the structure of a microprocessor according to the present invention. [Main reference number], 1...Internal reset signal,
2...Program counter, 3...Instruction code bus, 4...Multiplexer, 5...Program counter output, 6...Multiplexer output, 7...
Microprogram ROM, 8...Execution end signal, 9...Execution start signal, 10...Instruction execution control circuit, 11...Clock counter output, 12...Clock counter, 13...Internal clock signal, 1
4...Test mode selection signal.
Claims (1)
イクロプロセツサであつて、 １命令毎の実行終了信号により更新されるプロ
グラムカウンタと、 該プログラムカウンタの出力と外部から入力さ
れた命令コードとの何れかを、マイクロプロセツ
サの動作がテストモードであるか否かによつて選
択して、マイクロプログラムＲＯＭのアドレスと
して出力するマルチプレクサとを備え、 更に、各命令の実行開始時にリセツトされ、内
部クロツク信号を計数し、少なくとも最長の命令
を実行するのに要するクロツク数を計数すると命
令実行終了信号を出力するクロツクカウンタと、 前記実行終了信号あるいは前記クロツクカウン
タからの命令実行終了信号を得て、次の命令開始
信号を出力する制御回路と、 を備えることを特徴とするマイクロプロセツサ。[Claims for Utility Model Registration] A microprocessor whose operation is controlled by a microprogram, including a program counter that is updated by an execution end signal for each instruction, and the output of the program counter and instructions input from the outside. The multiplexer selects one of the codes depending on whether or not the microprocessor is operating in the test mode and outputs the selected address as the address of the microprogram ROM, and further includes a multiplexer that is reset at the start of execution of each instruction. , a clock counter that counts internal clock signals and outputs an instruction execution end signal when counting the number of clocks required to execute at least the longest instruction; and the execution end signal or an instruction execution end signal from the clock counter. 1. A microprocessor comprising: a control circuit that outputs a next instruction start signal upon receiving a signal;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6954886U JPS62183255U (en) | 1986-05-08 | 1986-05-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6954886U JPS62183255U (en) | 1986-05-08 | 1986-05-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62183255U true JPS62183255U (en) | 1987-11-20 |
Family
ID=30910378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6954886U Pending JPS62183255U (en) | 1986-05-08 | 1986-05-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62183255U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56108155A (en) * | 1980-01-31 | 1981-08-27 | Omron Tateisi Electronics Co | Protecting device for microprocessor |
| JPS6031652A (en) * | 1983-08-01 | 1985-02-18 | Nec Corp | Microcomputer incorporating read-only memory |
| JPS6167148A (en) * | 1984-09-10 | 1986-04-07 | Nec Corp | Microcomputer |
-
1986
- 1986-05-08 JP JP6954886U patent/JPS62183255U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56108155A (en) * | 1980-01-31 | 1981-08-27 | Omron Tateisi Electronics Co | Protecting device for microprocessor |
| JPS6031652A (en) * | 1983-08-01 | 1985-02-18 | Nec Corp | Microcomputer incorporating read-only memory |
| JPS6167148A (en) * | 1984-09-10 | 1986-04-07 | Nec Corp | Microcomputer |
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