JPH0358742U - - Google Patents
Info
- Publication number
- JPH0358742U JPH0358742U JP1989117753U JP11775389U JPH0358742U JP H0358742 U JPH0358742 U JP H0358742U JP 1989117753 U JP1989117753 U JP 1989117753U JP 11775389 U JP11775389 U JP 11775389U JP H0358742 U JPH0358742 U JP H0358742U
- Authority
- JP
- Japan
- Prior art keywords
- microprocessor
- input
- output port
- protect switch
- write protect
- 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 3
Landscapes
- Storage Device Security (AREA)
Description
第１図は本考案の実施例を示すブロツク図、第
２図は従来例を示すブロツク図、第３図は第２図
に示すライトプロテクトスイツチ周辺の回路構成
を示す図である。
１１……ライトプロクトスイツチ、１２……マ
イクロプロセツサ、１３……ＲＡＭ、１４……バ
ツクアツプ制御回路、１５……電池。
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing a conventional example, and FIG. 3 is a diagram showing a circuit configuration around the write protect switch shown in FIG. 11...Write protection switch, 12...Microprocessor, 13...RAM, 14...Backup control circuit, 15...Battery.
Claims (1)
サの入出力ポートに接続され、本体からのデータ
の書込みを許可／禁止することを指示するライト
プロテクトスイツチと、上記入出力ポートを介し
てその状態を識別し内蔵ＲＡＭに対する書込み信
号を制御するメモリ制御回路とを具備することを
特徴とするＩＣメモリカード。 A microprocessor, a write protect switch that is connected to the input/output port of this microprocessor and instructs to permit/disable writing of data from the main unit, and a built-in write protect switch that identifies its status via the input/output port. An IC memory card characterized by comprising a memory control circuit that controls a write signal to a RAM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989117753U JPH0358742U (en) | 1989-10-06 | 1989-10-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989117753U JPH0358742U (en) | 1989-10-06 | 1989-10-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0358742U true JPH0358742U (en) | 1991-06-07 |
Family
ID=31665956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989117753U Pending JPH0358742U (en) | 1989-10-06 | 1989-10-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0358742U (en) |
-
1989
- 1989-10-06 JP JP1989117753U patent/JPH0358742U/ja active Pending
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