JPS59134842U - One-chip microcontroller memory expansion device for in-vehicle electronic equipment - Google Patents
One-chip microcontroller memory expansion device for in-vehicle electronic equipmentInfo
- Publication number
- JPS59134842U JPS59134842U JP2727783U JP2727783U JPS59134842U JP S59134842 U JPS59134842 U JP S59134842U JP 2727783 U JP2727783 U JP 2727783U JP 2727783 U JP2727783 U JP 2727783U JP S59134842 U JPS59134842 U JP S59134842U
- Authority
- JP
- Japan
- Prior art keywords
- electronic equipment
- expansion device
- vehicle electronic
- chip microcontroller
- data
- 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 1
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は本考案の一実施例を示す回路構成図、第２図及
び第３図ｃｊそれぞれデータ読込み時及び書込み時のタ
イムチャート、第４図及び第５図はそれぞれデータ読込
み時及び書込み時のフローチャートである。
１・・・ワンチップマイコン（ＣＰＵ）、２・・・デー
タ・アドレスバス、３・・・外部メモリ、４…アドレス
ラッチ回路、５・・・アドレスバス、６・・・アドレス
デコーダ、７・・・）ツチ制御信号線、８・・・リード
／ライト信号線、９・・・チップ選択信号線。Fig. 1 is a circuit configuration diagram showing an embodiment of the present invention, Figs. 2 and 3 are time charts when reading and writing data, respectively, and Figs. 4 and 5 are timing charts when reading and writing data, respectively. This is a flowchart. 1... One-chip microcomputer (CPU), 2... Data/address bus, 3... External memory, 4... Address latch circuit, 5... Address bus, 6... Address decoder, 7...・) Tsuchi control signal line, 8... Read/write signal line, 9... Chip selection signal line.
Claims (1)
ンにおいて、その入出力ポートにデータ・アドレスバス
を接続し、このデータ・アドレスバスを分岐して一方を
外部メモリのデータ入出力ポートに接続し、他方をアド
レスラッチ回路及びアドレスバスを介して外部メモリの
アドレスポートに接続したことを特徴とする車載電子機
器用のワンチップマイコンのメモリ拡張装置。In a one-chip microcontroller with built-in memory and no external access terminals, a data/address bus is connected to its input/output ports, this data/address bus is branched, one is connected to the data input/output port of the external memory, and the other is connected to the data/address bus. A one-chip microcomputer memory expansion device for in-vehicle electronic equipment, characterized in that it is connected to an address port of an external memory via an address latch circuit and an address bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2727783U JPS59134842U (en) | 1983-02-28 | 1983-02-28 | One-chip microcontroller memory expansion device for in-vehicle electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2727783U JPS59134842U (en) | 1983-02-28 | 1983-02-28 | One-chip microcontroller memory expansion device for in-vehicle electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59134842U true JPS59134842U (en) | 1984-09-08 |
Family
ID=30158172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2727783U Pending JPS59134842U (en) | 1983-02-28 | 1983-02-28 | One-chip microcontroller memory expansion device for in-vehicle electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59134842U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02311942A (en) * | 1989-05-26 | 1990-12-27 | Nec Corp | Cpu external access bus system |
| JPH04112209A (en) * | 1990-09-03 | 1992-04-14 | Fuji Electric Co Ltd | Programmable controller |
-
1983
- 1983-02-28 JP JP2727783U patent/JPS59134842U/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02311942A (en) * | 1989-05-26 | 1990-12-27 | Nec Corp | Cpu external access bus system |
| JPH04112209A (en) * | 1990-09-03 | 1992-04-14 | Fuji Electric Co Ltd | Programmable controller |
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