JPH0325924U - - Google Patents
Info
- Publication number
- JPH0325924U JPH0325924U JP8466389U JP8466389U JPH0325924U JP H0325924 U JPH0325924 U JP H0325924U JP 8466389 U JP8466389 U JP 8466389U JP 8466389 U JP8466389 U JP 8466389U JP H0325924 U JPH0325924 U JP H0325924U
- Authority
- JP
- Japan
- Prior art keywords
- oscillation
- signal
- circuit
- microcomputer
- frequency
- 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
- 230000010355 oscillation Effects 0.000 claims description 18
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 1
Description
図面は本考案のマイクロコンピユータの発振切
換回路を示すブロツク図である。
１……マイクロコンピユータ、５……水晶振動
子、１１……ＰＬＬ回路、１６……タイミング信
号発生回路、１７……ＣＰＵ、１８……割り込み
信号発生回路、１９……制御回路。
The drawing is a block diagram showing the oscillation switching circuit of the microcomputer of the present invention. DESCRIPTION OF SYMBOLS 1... Microcomputer, 5... Crystal resonator, 11... PLL circuit, 16... Timing signal generation circuit, 17... CPU, 18... Interrupt signal generation circuit, 19... Control circuit.
Claims (1)
１の発振信号に基づいて、割り込み信号を発生す
る割り込み信号発生回路と、 第２の発振信号を出力する第２の発振回路と前
記第２の発振信号に基づいて所定周波数の分周信
号を出力する分周回路とを含み、前記分周信号の
位相を前記第１の発振信号の位相に一致させるＰ
ＬＬ回路と、 前記第２の発振信号に基づいて、ＣＰＵを動作
させるためのタイミング信号を発生するタイミン
グ信号発生回路と、 前記割り込み信号に基づいて前記第２の発振回
路を動作させ、且つ前記ＣＰＵから出力される停
止信号に基づいて前記第２の発振回路の動作を停
止させる制御回路とを備え、 前記第１の発振信号又は前記第２の発振信号を
切り換えてマイクロコンピユータを動作させるこ
とを特徴とするマイクロコンピユータの発振切換
回路。 (2) 前記第１の発振回路は、水晶振動子を含ん
で成ることを特徴とする請求項(1)記載のマイク
ロコンピユータの発振切換回路。 (3) 前記第２の発振信号は、前記第１の発振信
号より高い周波数を有することを特徴とする請求
項(1)記載のマイクロコンピユータの発振切換回
路。[Claims for Utility Model Registration] (1) An interrupt signal generation circuit that generates an interrupt signal based on a first oscillation signal generated from at least a first oscillation circuit; and a second oscillation circuit that outputs a second oscillation signal. and a frequency dividing circuit that outputs a frequency-divided signal of a predetermined frequency based on the second oscillation signal, and matches the phase of the frequency-divided signal with the phase of the first oscillation signal.
a LL circuit; a timing signal generation circuit that generates a timing signal for operating the CPU based on the second oscillation signal; and a timing signal generation circuit that operates the second oscillation circuit based on the interrupt signal and that operates the CPU. and a control circuit that stops the operation of the second oscillation circuit based on a stop signal output from the microcomputer, and operates the microcomputer by switching between the first oscillation signal and the second oscillation signal. Oscillation switching circuit for microcomputer. (2) The oscillation switching circuit for a microcomputer according to claim 1, wherein the first oscillation circuit includes a crystal resonator. (3) The oscillation switching circuit for a microcomputer according to claim (1), wherein the second oscillation signal has a higher frequency than the first oscillation signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8466389U JPH0325924U (en) | 1989-07-19 | 1989-07-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8466389U JPH0325924U (en) | 1989-07-19 | 1989-07-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0325924U true JPH0325924U (en) | 1991-03-18 |
Family
ID=31633288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8466389U Pending JPH0325924U (en) | 1989-07-19 | 1989-07-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0325924U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08276402A (en) * | 1995-04-04 | 1996-10-22 | Ryobi Ltd | Boring machine |
-
1989
- 1989-07-19 JP JP8466389U patent/JPH0325924U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08276402A (en) * | 1995-04-04 | 1996-10-22 | Ryobi Ltd | Boring machine |
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