JPS6418352U - - Google Patents
Info
- Publication number
- JPS6418352U JPS6418352U JP11098687U JP11098687U JPS6418352U JP S6418352 U JPS6418352 U JP S6418352U JP 11098687 U JP11098687 U JP 11098687U JP 11098687 U JP11098687 U JP 11098687U JP S6418352 U JPS6418352 U JP S6418352U
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- integrated circuit
- input
- circuit
- line
- 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
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Techniques For Improving Reliability Of Storages (AREA)
Description
第１図は本考案実施例のマイクロコンピユータ
集積回路の内部メモリ保護回路の回路ブロツク図
、第２図は従来のマイクロコンピユータ集積回路
の内部メモリ保護回路の回路ブロツク図である。
１……マイクロコンピユータ集積回路、２……
揮発性内部メモリ、３，４……第１の出力線（列
線）、５……スイツチ、６……トランジスタスイ
ツチ、７，８，９……第２の出力線（行線）、１
０，１１，１２……入力端子、１３……入力回路
、１５……電源、１７……リツプル除去用コンデ
ンサ、１８……逆流阻止ダイオード。
FIG. 1 is a circuit block diagram of an internal memory protection circuit of a microcomputer integrated circuit according to an embodiment of the present invention, and FIG. 2 is a circuit block diagram of an internal memory protection circuit of a conventional microcomputer integrated circuit. 1... Microcomputer integrated circuit, 2...
volatile internal memory, 3, 4...first output line (column line), 5...switch, 6...transistor switch, 7, 8, 9...second output line (row line), 1
0, 11, 12...Input terminal, 13...Input circuit, 15...Power supply, 17...Ripple removal capacitor, 18...Reverse current blocking diode.
Claims (1)
積回路と、常時時分割的に順次“Ｈ”信号を出力
する複数の列線からなる出力線とこの複数の列線
との交点にスイツチが配置された複数の行線から
なる入力線を入力端子に接続した前記マイクロコ
ンピユータ集積回路の入力回路と、前記マイクロ
コンピユータ集積回路の電源入力端子と電源との
間に接続されたリツプル除去用コンデンサと該コ
ンデンサの電荷が電源に逆流するのを阻止する逆
流阻止ダイオードとよりなり、前記スイツチを、
トランジスタスイツチで構成する場合、そのエミ
ツタ電極に前記出力線を、コレクタ電極に前記入
力線を、ベース電極に前記逆流阻止ダイオードの
アノード電極を接続することを特徴とするマイク
ロコンピユータ集積回路の内部メモリ保護回路。 A microcomputer integrated circuit having a volatile memory, a plurality of output lines consisting of a plurality of column lines that sequentially output "H" signals in a time-divided manner, and a plurality of switches arranged at the intersections of the plurality of column lines. an input circuit of the microcomputer integrated circuit in which an input line consisting of a row line is connected to an input terminal; a ripple removal capacitor connected between the power supply input terminal of the microcomputer integrated circuit and the power supply; The switch consists of a reverse current blocking diode that prevents current from flowing back into the power supply.
In the case of a transistor switch, the output line is connected to its emitter electrode, the input line is connected to its collector electrode, and the anode electrode of the reverse current blocking diode is connected to its base electrode. circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11098687U JPS6418352U (en) | 1987-07-20 | 1987-07-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11098687U JPS6418352U (en) | 1987-07-20 | 1987-07-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6418352U true JPS6418352U (en) | 1989-01-30 |
Family
ID=31348644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11098687U Pending JPS6418352U (en) | 1987-07-20 | 1987-07-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6418352U (en) |
-
1987
- 1987-07-20 JP JP11098687U patent/JPS6418352U/ja active Pending