JPH01308059A - Semiconductor integrated circuit device - Google Patents

Abstract

PURPOSE:To switch the functions of a semiconductor integrated circuit in response to its utility without limiting the number of external signal terminals by switching the functions of the integrated circuit in response to the applying direction of a DC voltage to be applied between power source terminals. CONSTITUTION:External terminals 31, 32 are of power source terminals, and a power source voltage is applied therebetween. External terminals 33-36 are of signal input/output terminals of an internal circuit 29A. A voltage direction uniformizing circuit 30A is connected between the terminals 31 and 32 in a semiconductor integrated circuit 10A. This circuit 30A is the same in configuration as a full-wave rectifier, the cathode of a diode 30a and the anode of a diode 30b are connected commonly to the terminal 31, the anode of a diode 30c and the cathode of a diode 30d are connected commonly to the terminal 32, the cathode of the diode 30b and the cathode of the diode 30c are connected commonly to the +Vcc terminal of the circuit 29A, and the anode of the diode 30a and the anode of the diode 30d are connected commonly to a GND terminal of the circuit 29A.

Description

【発明の詳細な説明】 ［目次Ｊ 概要 産業上の利用分野 従来の技術（第３図） 発明が解決しようとする課題 課題を解決するための手段（第１図） 作用 実施例 一実施例（第２図） 拡張 発明の効果 し概要］ 半導体集積回路の機能を切り換える半導体集積回路装置
に関し、 外部信号端子の本数を制限することなく半導体集積回路
の機能を用途に応じて切り換えることができることを目
的とし、 電源端子間に接続され、該電源端子間に印加される直流
電圧の印加方向に拘わらず該直流電圧を一定方向の直流
電圧にして、複数の外部信号端子を備えた内部回路へ供
給する電圧方向一定化手段を備え、該電源端子間に印加
される直流電圧の印加方向に応じて該内部回路の機能を
切り換えるように構成する。[Detailed description of the invention] [Table of Contents J Overview Industrial field of application Prior art (Figure 3) Problems to be solved by the invention Means for solving the problems (Figure 1) Working examples One example ( Figure 2) Outline of the effects of the extended invention] Regarding a semiconductor integrated circuit device that switches the functions of a semiconductor integrated circuit, the object is to be able to switch the functions of a semiconductor integrated circuit according to the application without limiting the number of external signal terminals. and is connected between power supply terminals, and regardless of the direction of application of the DC voltage applied between the power supply terminals, the DC voltage is converted into a DC voltage in a constant direction, and is supplied to an internal circuit equipped with a plurality of external signal terminals. The device includes voltage direction constantization means and is configured to switch the function of the internal circuit depending on the direction of application of the DC voltage applied between the power supply terminals.

［産業上の利用分野］ 本発明は半導体集積回路の機能を切り換える半導体集積
回路装置に関する。[Industrial Application Field] The present invention relates to a semiconductor integrated circuit device that switches the functions of a semiconductor integrated circuit.

「従来の技術］ 半導体集積回路では、汎用性の高いものが要求される。“Conventional technology” Semiconductor integrated circuits are required to be highly versatile.

例えば第３図に示すような、マイクロプロセッサ１では
、３３番ピン２の電位をハイレベルにすると、マイクロ
プロセッサ１の動作モードがミニマムモード（ＭＮ）に
なるとともに、２３〜３１番ビン３の端子機能が（）内
に示す記号のものとなり、３３番ピン２の電位をロウレ
ベルにすると、マイクロプロセッサｌの動作モードがマ
キシマムモード（ＭＸ）になるとともに、２３〜３１番
ピン３の端子機能が（）外に示す記号のものとなるよう
に構成されている。For example, in a microprocessor 1 as shown in FIG. 3, when the potential of the 33rd pin 2 is set to high level, the operating mode of the microprocessor 1 becomes minimum mode (MN), and the terminals of the 23rd to 31st pins 3 are set to the minimum mode (MN). The functions are those shown in parentheses, and when the potential of No. 33 pin 2 is set to low level, the operation mode of the microprocessor I becomes maximum mode (MX), and the terminal functions of No. 23 to No. 31 pins 3 become ( ) is constructed to have the symbol shown outside.

したがって、ユーザは用途の応じて３３番ピン２の電位
を変えることにより目的とする機能を得ることができ、
マイクロプロセッサ１の汎用性が高くなる。Therefore, the user can obtain the desired function by changing the potential of pin 33 according to the application.
The versatility of the microprocessor 1 is increased.

［発明が解決しようとする課題１ しかし、半導体集積回路に対する動作モードの多機能化
が要求される一方、半導体集積回路の外部端子の本数は
限られているので、外部信号端子以外に機能切換用の端
子を余分に設けることができなかったり、外部信号端子
の本数を制限しなければならない場合があった。[Problem to be Solved by the Invention 1] However, while there is a demand for semiconductor integrated circuits to have multiple operating modes, the number of external terminals of semiconductor integrated circuits is limited. In some cases, it is not possible to provide extra terminals, or it is necessary to limit the number of external signal terminals.

本発明の目的は、上記問題点に鑑み、外部信号端子の本
数を制限することなく集積回路の機能を用途に応じて切
り換えることができる半導体集積回路装置を提供するこ
とにある。SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a semiconductor integrated circuit device in which the functions of an integrated circuit can be switched according to the application without limiting the number of external signal terminals.

［課題を解決するための手段Ｊ 第１図は本発明の構成を示す原理ブロック図である。[Means to solve the problem J FIG. 1 is a principle block diagram showing the configuration of the present invention.

図中、１０は半導体集積回路であり、電源端子１１．２
０及び複数の外部信号端子１２〜１９．２１〜２８を備
えている。In the figure, 10 is a semiconductor integrated circuit, and power terminals 11.2
0 and a plurality of external signal terminals 12-19, and 21-28.

３０は電圧方向−走化手段であり、電源端子■ｌ、２０
間に接続され、この電源端子間に印加される直流電圧の
印加方向に拘わらず該直流電圧を一定方向の直流電圧に
して内部回路２９へ供給する。30 is a voltage direction/chemotization means, and a power terminal ■l, 20
Regardless of the direction of application of the DC voltage applied between the power supply terminals, the DC voltage is converted into a DC voltage in a constant direction and supplied to the internal circuit 29.

内部回路２９の機能は、電源端子１１．２０に印加され
る直流電圧の印加方向に応じて切り換えられる。The function of the internal circuit 29 is switched depending on the direction of application of the DC voltage applied to the power supply terminal 11.20.

［作用ｊ 半導体集積回路！０の電源端子間１１．２０に印加する
電圧の印加方向を変えることに上り内部回路２９の機能
が切換えられる。[Action j Semiconductor integrated circuit! The function of the upstream internal circuit 29 is switched by changing the direction of application of the voltage applied between the power supply terminals 11.20.

したがって、機能切換用の特別な外部端子を半導体集積
回路ｌＯに設ける必要がない。Therefore, there is no need to provide the semiconductor integrated circuit IO with a special external terminal for switching functions.

また、電源端子１１，２０間への電圧の印加方向によら
ず、内部回路２９に一定方向の直流電圧が印加されるの
で、電源端子間ｔｉ、２０へ加える電圧の印加方向を間
違えても回路素子が破壊されることがない。In addition, since a DC voltage in a fixed direction is applied to the internal circuit 29 regardless of the direction in which the voltage is applied between the power supply terminals 11 and 20, even if the direction of voltage applied between the power supply terminals ti and 20 is incorrect, the circuit The element will not be destroyed.

［実施例コ （１）−実施例 第２図に基づいて本発明の一実施例を説明する。[Example code] (1)-Example An embodiment of the present invention will be described based on FIG.

半導体集積回路１０Ａは複数の外部端子３１〜３６を備
えている。外部端子３１，３２は電源端子であり、これ
らの間に例えば５ｖの電源電圧が印加される。また、外
部端子３３〜３６は内部回路２９Ａの信号入出力端子で
ある。The semiconductor integrated circuit 10A includes a plurality of external terminals 31-36. The external terminals 31 and 32 are power supply terminals, and a power supply voltage of, for example, 5V is applied between them. Further, the external terminals 33 to 36 are signal input/output terminals of the internal circuit 29A.

半導体集積回路１０Ａ内には、外部端子３１゜３２間に
電圧方向−走化回路３０Ａが接続されている。この電圧
方向−走化回路３０Ａは全波整流回路と同一構成であり
、ダイオード３０ａのカソードとダイオード３０ｂのア
ノードが共通に電源端子３１に接続され、ダイオード３
０ｃのアノードとダイオード３０ｄのカソードが共通に
電源端子３２に接続され、ダイオード３０ｂのカソード
とダイオード３０ｃのカソードが共通に内部回路２９Ａ
の＋■ｃｃ端子に接続され、ダイオード３０＆のアノー
ドとダイオード３０ｄのアノードが共連に内部回路２９
ＡのＧＮＤ端子に接続されている。すなわち、従来外部
端子であった＋Ｖｃｃ端子及びＧＮＤ端子が内部端子と
なっている。Inside the semiconductor integrated circuit 10A, a voltage direction/travel circuit 30A is connected between external terminals 31 and 32. This voltage direction/transition circuit 30A has the same configuration as a full-wave rectifier circuit, and the cathode of the diode 30a and the anode of the diode 30b are commonly connected to the power supply terminal 31, and the diode 3
The anode of the diode 0c and the cathode of the diode 30d are commonly connected to the power supply terminal 32, and the cathode of the diode 30b and the cathode of the diode 30c are commonly connected to the internal circuit 29A.
The anode of the diode 30& and the anode of the diode 30d are connected to the +■cc terminal of the internal circuit 29.
Connected to the GND terminal of A. That is, the +Vcc terminal and GND terminal, which were conventionally external terminals, have become internal terminals.

また、電源端子３２は内部回路２９Ａの機能切換端子Ｘ
／Ｙにも接続されている。In addition, the power supply terminal 32 is the function switching terminal X of the internal circuit 29A.
/Y is also connected.

次に上記の如く構成された本実施例の動作を説明する。Next, the operation of this embodiment configured as described above will be explained.

外部電源回路（不図示）の正極端子を電源端子３１に接
続し負極端子を電源端子３２に接続すると、電流は電源
端子３１からダイオード３０ｂ、＋ＶＣＣ端子を介し内
部回路２９Ａ内へ流れ、次いでＧＮＤ端子、ダイオード
３０ｄを介し電源端子３２を通って外部電源回路へ戻る
。この場合、機能切換端子Ｘ／Ｙがロウレベルであるの
で、内部回路２９Ａは、動作モードをＸモードとし、か
つ、外部信号端子３３〜３６をこのＸモードに対応した
外部信号入出力端子とする。When the positive terminal of an external power supply circuit (not shown) is connected to the power supply terminal 31 and the negative terminal is connected to the power supply terminal 32, current flows from the power supply terminal 31 to the internal circuit 29A via the diode 30b and the +VCC terminal, and then to the GND terminal. , and returns to the external power supply circuit through the power supply terminal 32 via the diode 30d. In this case, since the function switching terminal X/Y is at a low level, the internal circuit 29A sets the operation mode to the X mode, and sets the external signal terminals 33 to 36 as external signal input/output terminals corresponding to the X mode.

逆、外部電源回路の負極端子を電源端子３１に接続し、
正極端子を電源端子３２に接続すると、電流は電源端子
３２からダイオード３０ｃ、４−Ｖｃｃ端子を介し内部
回路２９Ａ内へ流れ、次いでＧＮＤ端子、ダイオード３
０ａを介し電源端子３２を通って外部電源回路へ戻る。Conversely, connect the negative terminal of the external power supply circuit to the power supply terminal 31,
When the positive terminal is connected to the power supply terminal 32, current flows from the power supply terminal 32 to the internal circuit 29A via the diode 30c and the 4-Vcc terminal, and then to the GND terminal and the diode 3.
It returns to the external power supply circuit through the power supply terminal 32 via 0a.

この場合、機能切換端子Ｘ／Ｙがハイレベルであるので
、内部回路２９Δは動作モードをＹモードとし、かつ、
外部信号端子３３〜３ＧをこのＹモードに対応しん外部
信号入出力端子とする。In this case, since the function switching terminal X/Y is at high level, the internal circuit 29Δ sets the operation mode to Y mode, and
The external signal terminals 33 to 3G are used as external signal input/output terminals corresponding to this Y mode.

（２）拡張 なお、本発明の思想は半導体集積回路以外にも適用する
ことができろ。例えば各種計測器において、電源電圧の
印加方向に応じて計測器の出力信号を１〜５ｖまたは０
〜２０ｍＡに切り換えて出力するようにしてもよい。ま
た、例えば出力が２値信号である各種検出器の電子回路
に適用し、電源電圧印加方向に応じて、出力信号のロウ
レベルとハイレベルが逆になるように切り換え又はａ接
点出力とｂ接点出力のいづれか一方に切り換える構成に
することもできる。(2) Expansion Note that the idea of the present invention can be applied to other than semiconductor integrated circuits. For example, in various measuring instruments, the output signal of the measuring instrument may be 1 to 5 V or 0 V depending on the direction in which the power supply voltage is applied.
The output may be switched to 20 mA. For example, it can be applied to electronic circuits of various detectors whose output is a binary signal, and can be switched so that the low level and high level of the output signal are reversed, or the a contact output and the b contact output, depending on the direction of power supply voltage application. It is also possible to configure the configuration to switch to either one.

さらに、切り換えられる機能は特に限定されず、例えば
その１つが半導体集積回路のハードウエアヂエックをす
るためのテストモードであってもよい。Further, the functions to be switched are not particularly limited, and one of them may be a test mode for performing a hardware check of a semiconductor integrated circuit, for example.

また、上記実施例では、電源端子が２端子である場合を
説明したが、３端子以上の場合であってもよい。例えば
３端子の場合には６通りの電圧印加方向（方法）がある
ので、最大６機能の切り換えを行うことができる。Further, in the above embodiment, the case where the power supply terminal is two terminals has been described, but the case where there are three or more terminals may be used. For example, in the case of three terminals, there are six voltage application directions (methods), so a maximum of six functions can be switched.

［発明の効果］ 以上説明した如く、本発明に係る半導体集積回路装置で
は、電源端子間に印加される直流電圧の印加方向に応じ
て集積回路の機能を切り換えるように構成したので、機
能切換用の外部端子を特別に設ける必要がなく、その分
、外部信号入出力端子の本数を増やすことができるとい
う優れた効果を奏する。[Effects of the Invention] As explained above, the semiconductor integrated circuit device according to the present invention is configured to switch the function of the integrated circuit depending on the direction of application of the DC voltage applied between the power supply terminals. It is not necessary to provide a special external terminal, and the number of external signal input/output terminals can be increased accordingly, which is an excellent effect.

そのうえ、電源端子間に印加される直流電圧の印加方向
に拘わらず、一定方向の直流電圧が集積回路に印加され
るので、電源端子間の電圧印加方向を間違えても回路素
子が破壊されることがないという優れた効果も奏する。Furthermore, regardless of the direction of the DC voltage applied between the power supply terminals, a fixed direction of DC voltage is applied to the integrated circuit, so even if the voltage is applied in the wrong direction between the power supply terminals, the circuit elements will not be destroyed. It also has the excellent effect of not having any.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の構成を示す原理ブロック図、第２図は
本発明の一実施例を示す回路図、第３図は従来例の問題
点の説明に供する図である。′ 図中、 １０Ａは半導体集積回路 ２９Ａは内部回路 ３０Ａは電圧方向−電化回路 ３０　ａ　〜３０　ｄはダイオード ３１．３２は電源端子 ３３〜３６は外部信号端子 Ｘ／Ｙは機能切換端子 発明の原理ブロック図 半導体集積回路１０Ａ。 従来例 第３図 ｃｃ Ａ　１６／Ｓ　３ Ａ１７／３４ Ａ　１８／Ｓ　５ Ａ１９／３６ ＢＨＥ／Ｓ７ ＭＮ／ＭＸ Ｄ 閥／グて（ＨＯＬＤ） ＲＱ／ＧＴＩ　（ＨＬＤＡ） ＬＯＣＫ　　　（ＷＲ） Ｓ２　　　　　（Ｍ／ｌ０） Ｓｌ　　　　　（ＤＴ／酌 罰　　　　（ＤＥＮ） ＱＳＯ（ＡＬＥ） ＱＳＩ　　　　（ＬＮＴＡ） ＴＥＳＴ　　　（ＴＥＳＴ） ＥＡＤＹ ＥＳＥＴFIG. 1 is a principle block diagram showing the configuration of the present invention, FIG. 2 is a circuit diagram showing an embodiment of the present invention, and FIG. 3 is a diagram for explaining problems in the conventional example. ' In the figure, 10A is a semiconductor integrated circuit 29A is an internal circuit 30A is a voltage direction - electrical circuits 30 a to 30 d are diodes 31. 32 is a power supply terminal 33 to 36 is an external signal terminal X/Y is a function switching terminal Block diagram semiconductor integrated circuit 10A. Conventional example Fig. 3 cc A 16/S 3 A17/34 A 18/S 5 A19/36 BHE/S7 MN/MX D Fold/Gute (HOLD) RQ/GTI (HLDA) LOCK (WR) S2 (M/ l0) Sl (DT/Extenuating Punishment (DEN) QSO (ALE) QSI (LNTA) TEST (TEST) EADY ESET

Claims (1)

【特許請求の範囲】[Claims] 　電源端子（１１、２０）間に接続され、該電源端子間
に印加される直流電圧の印加方向に拘わらず該直流電圧
を一定方向の直流電圧にして、複数の外部信号端子（１
２〜１９、２１〜２８）を備えた内部回路（２９）へ供
給する電圧方向一定化手段（３０）を備え、該電源端子
（１１、２０）間に印加される直流電圧の印加方向に応
じて該内部回路（２９）の機能を切り換えるようにした
ことを特徴とする半導体集積回路装置The DC voltage is connected between the power supply terminals (11, 20) and is connected to a plurality of external signal terminals (1
2 to 19, 21 to 28), and includes voltage direction constantization means (30) for supplying a voltage to an internal circuit (29) equipped with the power supply terminals (11, 20). A semiconductor integrated circuit device characterized in that the function of the internal circuit (29) is switched by