JPS6384634U - - Google Patents
Info
- Publication number
- JPS6384634U JPS6384634U JP17771986U JP17771986U JPS6384634U JP S6384634 U JPS6384634 U JP S6384634U JP 17771986 U JP17771986 U JP 17771986U JP 17771986 U JP17771986 U JP 17771986U JP S6384634 U JPS6384634 U JP S6384634U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- oscillation
- output
- selection gate
- oscillation circuit
- 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.)
- Granted
Links
- 230000010355 oscillation Effects 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 claims 1
- 239000000919 ceramic Substances 0.000 claims 1
- 239000013078 crystal Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Description
第１図は本考案の実施例を示すブロツク図、第
２図は第１図の動作を示すタイミング図である。
１…第１の発振回路、２…第２の発振回路、３
…選択ゲート回路、４…システムクロツク作成回
路、５…分周回路、６，９，１２…Ｒ―ＳＦＦ。
FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a timing diagram showing the operation of FIG. 1. 1...First oscillation circuit, 2...Second oscillation circuit, 3
...Selection gate circuit, 4...System clock generation circuit, 5...Frequency division circuit, 6, 9, 12...R-SFF.
Claims (1)
れた第１の発振回路と、抵抗及びコンデンサが接
続された第２の発振回路と、前記第１の発振回路
の発振出力と第２の発振回路の発振出力が印加さ
れた選択ゲート回路と、該選択ゲート回路からの
出力に基いてシステムクロツクを作成するシステ
ムクロツク作成回路と、前記選択ゲート回路から
の出力を分周する分周回路と、前記第１の発振回
路及び第２の発振回路の動作を停止させる信号及
び初期設定信号に基いて前記第２の発振回路の発
振出力を選択し前記分周回路の出力に基いて前記
第１の発振回路の発振出力を選択するよう前記選
択ゲート回路を制御する制御回路とを備えて成る
クロツクパルス発生回路。 A first oscillation circuit to which a vibrating element such as crystal or ceramic is connected, a second oscillation circuit to which a resistor and a capacitor are connected, an oscillation output of the first oscillation circuit, and an oscillation output of the second oscillation circuit. a selection gate circuit to which the selection gate circuit is applied, a system clock creation circuit that creates a system clock based on the output from the selection gate circuit, a frequency divider circuit that divides the output from the selection gate circuit; The oscillation output of the second oscillation circuit is selected based on a signal for stopping the operation of the first oscillation circuit and the second oscillation circuit and an initial setting signal, and the oscillation output of the second oscillation circuit is selected based on the output of the frequency dividing circuit. a control circuit for controlling the selection gate circuit to select the oscillation output of the clock pulse generation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986177719U JPH0449705Y2 (en) | 1986-11-19 | 1986-11-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986177719U JPH0449705Y2 (en) | 1986-11-19 | 1986-11-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6384634U true JPS6384634U (en) | 1988-06-03 |
| JPH0449705Y2 JPH0449705Y2 (en) | 1992-11-24 |
Family
ID=31119186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986177719U Expired JPH0449705Y2 (en) | 1986-11-19 | 1986-11-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0449705Y2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56168247A (en) * | 1980-05-29 | 1981-12-24 | Canon Inc | Information processor |
| JPS5840643A (en) * | 1981-09-03 | 1983-03-09 | Toshiba Corp | Oscillation control system of one-chip micro-computer |
| JPS61109217U (en) * | 1984-12-21 | 1986-07-10 |
-
1986
- 1986-11-19 JP JP1986177719U patent/JPH0449705Y2/ja not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56168247A (en) * | 1980-05-29 | 1981-12-24 | Canon Inc | Information processor |
| JPS5840643A (en) * | 1981-09-03 | 1983-03-09 | Toshiba Corp | Oscillation control system of one-chip micro-computer |
| JPS61109217U (en) * | 1984-12-21 | 1986-07-10 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0449705Y2 (en) | 1992-11-24 |
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