JPH01120258U - - Google Patents
Info
- Publication number
- JPH01120258U JPH01120258U JP1364788U JP1364788U JPH01120258U JP H01120258 U JPH01120258 U JP H01120258U JP 1364788 U JP1364788 U JP 1364788U JP 1364788 U JP1364788 U JP 1364788U JP H01120258 U JPH01120258 U JP H01120258U
- Authority
- JP
- Japan
- Prior art keywords
- level
- mpu
- time constant
- mode
- 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 4
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Microcomputers (AREA)
Description
第１図は本考案に係わるＭＰＵのモード選択回
路の一実施例を示す回路図、第２図は本考案の第
２の実施例を示す回路図、第３図は従来のＭＰＵ
のモード選択回路を示す回路図である。
７…ＭＰＵ、１１…抵抗、１２…コンデンサ、
１３…ダイオード、１４，１５…トランジスタ、
１６…モード設定抵抗、Ｔ１…電源端子、Ｔ５〜
Ｔ７…入力端子。
Fig. 1 is a circuit diagram showing an embodiment of an MPU mode selection circuit according to the present invention, Fig. 2 is a circuit diagram showing a second embodiment of the present invention, and Fig. 3 is a circuit diagram showing a conventional MPU mode selection circuit.
FIG. 2 is a circuit diagram showing a mode selection circuit of FIG. 7...MPU, 11...resistor, 12...capacitor,
13...Diode, 14,15...Transistor,
16...Mode setting resistor, T1...Power supply terminal, T5~
T7...Input terminal.
Claims (1)
り動作モードを決定するマイクロコンピユータを
用いた制御装置において、電源オン時に「Ｌ」レ
ベルで電源オン時から所定時間経過後に「Ｈ」レ
ベルとなる時定数信号をＭＰＵのリセツト端子へ
出力する時定数回路と、前記時定数信号の「Ｌ」
レベルおよび「Ｈ」レベルによりＭＰＵのモード
プログラミング端子を「Ｈ」レベルおよび開放と
するトランジスタと、前記時定数信号の「Ｌ」レ
ベルによりＭＰＵのモードプログラミング端子を
「Ｌ」レベルとするモード設定用ダイオードとに
よりモード選択を行なうことを特徴とするＭＰＵ
のモード選択回路。 (2) リセツト信号の立上り直前の信号状態によ
り動作モードを決定するマイクロコンピユータを
用いた制御装置において、電源オン時に「Ｌ」レ
ベルで電源オン時から所定時間経過後に「Ｈ」レ
ベルとなる時定数信号をＭＰＵのリセツト端子へ
出力する時定数回路と、前記時定数信号の「Ｌ」
レベルおよび「Ｈ」レベルによりＭＰＵのモード
プログラミング端子を「Ｈ」レベルおよび「Ｌ」
レベルとするトランジスタと、前記時定数信号の
「Ｌ」レベルによりＭＰＵのモードプログラミン
グ端子を「Ｈ」レベルとするモード設定抵抗とに
よりモード設定を行なうことを特徴とするＭＰＵ
のモード選択回路。[Claims for Utility Model Registration] (1) In a control device using a microcomputer that determines the operating mode based on the signal state immediately before the rise of the reset signal, the control device is set at "L" level when the power is turned on, and after a predetermined period of time has elapsed since the power is turned on. A time constant circuit that outputs a time constant signal that becomes "H" level to the reset terminal of the MPU, and a time constant circuit that outputs a time constant signal that becomes "H"level;
a transistor that sets the mode programming terminal of the MPU to the "H" level and opens the mode programming terminal of the MPU depending on the "H" level and the "H"level; and a mode setting diode that sets the mode programming terminal of the MPU to the "L" level depending on the "L" level of the time constant signal. An MPU characterized in that mode selection is performed by
mode selection circuit. (2) In a control device using a microcomputer that determines the operating mode based on the signal state immediately before the reset signal rises, the time constant is the "L" level when the power is turned on, and the time constant that changes to the "H" level after a predetermined time has elapsed since the power is turned on. A time constant circuit that outputs a signal to the reset terminal of the MPU, and the “L” level of the time constant signal.
The mode programming terminal of the MPU is set to “H” level and “L” level depending on the level and “H” level.
An MPU characterized in that mode setting is performed by a transistor that sets a level to a high level, and a mode setting resistor that sets a mode programming terminal of the MPU to a high level in response to a low level of the time constant signal.
mode selection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1364788U JPH01120258U (en) | 1988-02-05 | 1988-02-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1364788U JPH01120258U (en) | 1988-02-05 | 1988-02-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01120258U true JPH01120258U (en) | 1989-08-15 |
Family
ID=31224132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1364788U Pending JPH01120258U (en) | 1988-02-05 | 1988-02-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01120258U (en) |
-
1988
- 1988-02-05 JP JP1364788U patent/JPH01120258U/ja active Pending
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