JPH0438137U - - Google Patents
Info
- Publication number
- JPH0438137U JPH0438137U JP8054090U JP8054090U JPH0438137U JP H0438137 U JPH0438137 U JP H0438137U JP 8054090 U JP8054090 U JP 8054090U JP 8054090 U JP8054090 U JP 8054090U JP H0438137 U JPH0438137 U JP H0438137U
- Authority
- JP
- Japan
- Prior art keywords
- counter
- overflow
- exclusive
- underflow
- bit state
- 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
Description
第１図は本考案の一実施例の構成図、第２図は
第１図のカウンタの動作説明図、第３図は従来に
おけるアツプダウンカウンタの構成例を示した図
、第４図は第３図のカウンタの動作説明図である
。
２……カウンタ、３……排他的論理和ゲート。
FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the counter shown in FIG. 1, FIG. 3 is a diagram showing an example of the structure of a conventional up-down counter, and FIG. FIG. 4 is an explanatory diagram of the operation of the counter in FIG. 3; 2...Counter, 3...Exclusive OR gate.
Claims (1)
能をもつたアツプダウンカウンタにおいて、 カウンタのＭＳＢのビツト状態とＭＢＳよりも
１桁だけ下位にあるビツトのビツト状態を排他的
論理和をとる排他的論理和ゲートを有し、この排
他的論理和ゲートの出力レベルによりオーバーフ
ローまたはアンダーフローの発生を検出し、前記
ＭＳＢのビツト状態によりオーバーフローとアン
ダーフローを区別することを特徴とするアツプダ
ウンカウンタ。[Claims for Utility Model Registration] In an up-down counter with a function of detecting overflow and underflow, the bit state of the MSB of the counter and the bit state of the bit one digit lower than the MBS are subjected to exclusive ORing. The up-down device is characterized in that it has an exclusive OR gate, detects the occurrence of overflow or underflow based on the output level of the exclusive OR gate, and distinguishes between overflow and underflow based on the bit state of the MSB. counter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8054090U JPH0438137U (en) | 1990-07-27 | 1990-07-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8054090U JPH0438137U (en) | 1990-07-27 | 1990-07-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0438137U true JPH0438137U (en) | 1992-03-31 |
Family
ID=31625698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8054090U Pending JPH0438137U (en) | 1990-07-27 | 1990-07-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0438137U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02189026A (en) * | 1989-01-17 | 1990-07-25 | Mitsubishi Electric Corp | Detector for overflow and underflow of counter |
-
1990
- 1990-07-27 JP JP8054090U patent/JPH0438137U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02189026A (en) * | 1989-01-17 | 1990-07-25 | Mitsubishi Electric Corp | Detector for overflow and underflow of counter |
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