JPH022735U - - Google Patents
Info
- Publication number
- JPH022735U JPH022735U JP8033488U JP8033488U JPH022735U JP H022735 U JPH022735 U JP H022735U JP 8033488 U JP8033488 U JP 8033488U JP 8033488 U JP8033488 U JP 8033488U JP H022735 U JPH022735 U JP H022735U
- Authority
- JP
- Japan
- Prior art keywords
- flip
- flop
- power supply
- reset signal
- electronic equipment
- 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
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Power Sources (AREA)
- Debugging And Monitoring (AREA)
Description
第１図は本考案に係る電子機器の電圧低下検出
回路の構成を示す図、第２図は第１図のＣＰＵの
動作フローチヤート、第３図は従来の電子機器の
電圧低下検出回路の構成を示す図、第４図は第３
図のＣＰＵの動作フローチヤートである。
図中、１……バツクアツプ電源入力端子、２…
…フリツプフロツプ、３……ＣＰＵ、４……リセ
ツト信号兼フリツプフロツプ信号、５……出力信
号、６……時定数回路、７……ウオツチドツグタ
イマ、８……出力信号。
FIG. 1 is a diagram showing the configuration of a voltage drop detection circuit for an electronic device according to the present invention, FIG. 2 is an operation flowchart of the CPU shown in FIG. 1, and FIG. 3 is a configuration of a conventional voltage drop detection circuit for an electronic device. Figure 4 shows the third
It is an operation flowchart of the CPU shown in the figure. In the figure, 1... Backup power input terminal, 2...
...Flip-flop, 3...CPU, 4...Reset signal and flip-flop signal, 5...Output signal, 6...Time constant circuit, 7...Watchdog timer, 8...Output signal.
Claims (1)
源回路を有する電子機器の電源電圧の低下或いは
電源を取り外すことによつてセツトされるフリツ
プフロツプを具備し、該フリツプフロツプの出力
状態に従つてＲＡＭのイニシアライズを行なうか
否かを決定する電圧低下検出回路において、前記
フリツプフロツプのリセツト信号をウオツチドツ
グタイマのリセツト信号と兼用することを特徴と
する電子機器の電圧低下検出回路。 Computers and electronic equipment having a backup power supply circuit for memory protection are equipped with a flip-flop that is set by a drop in the power supply voltage or removal of the power supply, and whether or not the RAM is initialized according to the output state of the flip-flop. 1. A voltage drop detection circuit for electronic equipment, wherein the flip-flop reset signal is also used as a watchdog timer reset signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988080334U JPH0738990Y2 (en) | 1988-06-17 | 1988-06-17 | Voltage drop detection circuit for electronic devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988080334U JPH0738990Y2 (en) | 1988-06-17 | 1988-06-17 | Voltage drop detection circuit for electronic devices |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH022735U true JPH022735U (en) | 1990-01-10 |
| JPH0738990Y2 JPH0738990Y2 (en) | 1995-09-06 |
Family
ID=31305163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988080334U Expired - Lifetime JPH0738990Y2 (en) | 1988-06-17 | 1988-06-17 | Voltage drop detection circuit for electronic devices |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0738990Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62163151A (en) * | 1986-01-14 | 1987-07-18 | Matsushita Electric Ind Co Ltd | Initialization method for standby memory |
| JPH01100239U (en) * | 1987-12-21 | 1989-07-05 |
-
1988
- 1988-06-17 JP JP1988080334U patent/JPH0738990Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62163151A (en) * | 1986-01-14 | 1987-07-18 | Matsushita Electric Ind Co Ltd | Initialization method for standby memory |
| JPH01100239U (en) * | 1987-12-21 | 1989-07-05 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0738990Y2 (en) | 1995-09-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS63198567U (en) | ||
| JPS61160566U (en) | ||
| JPH022735U (en) | ||
| JPS62179638U (en) | ||
| JPH0164748U (en) | ||
| JPS5945637U (en) | Microcomputer output signal generation circuit device | |
| JPS6244348U (en) | ||
| JPH0263124U (en) | ||
| JPS58164022U (en) | Vehicle data recording device | |
| JPS6152439U (en) | ||
| JPS61199798U (en) | ||
| JPS62121654U (en) | ||
| JPS6086037U (en) | power start circuit | |
| JPS5844646U (en) | Dettman timer | |
| JPS61155928U (en) | ||
| JPH0289501U (en) | ||
| JPS62138229U (en) | ||
| JPS5984642U (en) | Data content protection circuit for semiconductor memory | |
| JPH0344721U (en) | ||
| JPS6368026U (en) | ||
| JPS60192024U (en) | Power supply for microprocessor | |
| JPS6165551U (en) | ||
| JPS5854713U (en) | Constant voltage power supply circuit | |
| JPS63147745U (en) | ||
| JPS61196325U (en) |