JPS5464444A - Memory extension method for microcomputer - Google Patents
Memory extension method for microcomputerInfo
- Publication number
- JPS5464444A JPS5464444A JP13064477A JP13064477A JPS5464444A JP S5464444 A JPS5464444 A JP S5464444A JP 13064477 A JP13064477 A JP 13064477A JP 13064477 A JP13064477 A JP 13064477A JP S5464444 A JPS5464444 A JP S5464444A
- Authority
- JP
- Japan
- Prior art keywords
- input
- output port
- rom
- microcomputer
- memory
- 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
Landscapes
- Microcomputers (AREA)
Abstract
PURPOSE: To enable the extension of memory and to increase the utilizing efficiency of the input and output port, by connecting the bus line of external memory to the input and output port of a single chip microcomputer.
CONSTITUTION: In ROM 25 placed at the external of the single chip microcomputer 24, the address lines A0 to A7 are connected to the output ports 221 and 222 of the input and output port 22 of the computer 24, and the data lines D0 to D7 are connected to the input ports 223 and 224. Accordingly, the deficiency of the capacity of ROM in the computer 24 can be compensated with ROM. Further, the input and output port can efficiently be used by making common use the input and output port to ROM and also external load.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13064477A JPS5464444A (en) | 1977-10-31 | 1977-10-31 | Memory extension method for microcomputer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13064477A JPS5464444A (en) | 1977-10-31 | 1977-10-31 | Memory extension method for microcomputer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5464444A true JPS5464444A (en) | 1979-05-24 |
Family
ID=15039171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13064477A Pending JPS5464444A (en) | 1977-10-31 | 1977-10-31 | Memory extension method for microcomputer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5464444A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS583054A (en) * | 1981-06-30 | 1983-01-08 | Nec Corp | Single chip microcomputer |
JPS63195734A (en) * | 1987-02-07 | 1988-08-12 | Diesel Kiki Co Ltd | Control data processor |
-
1977
- 1977-10-31 JP JP13064477A patent/JPS5464444A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS583054A (en) * | 1981-06-30 | 1983-01-08 | Nec Corp | Single chip microcomputer |
JPH03668B2 (en) * | 1981-06-30 | 1991-01-08 | Nippon Electric Co | |
JPS63195734A (en) * | 1987-02-07 | 1988-08-12 | Diesel Kiki Co Ltd | Control data processor |
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