JPS55135960A - Micro-computer - Google Patents
Micro-computerInfo
- Publication number
- JPS55135960A JPS55135960A JP4381879A JP4381879A JPS55135960A JP S55135960 A JPS55135960 A JP S55135960A JP 4381879 A JP4381879 A JP 4381879A JP 4381879 A JP4381879 A JP 4381879A JP S55135960 A JPS55135960 A JP S55135960A
- Authority
- JP
- Japan
- Prior art keywords
- rom
- terminal
- signal
- external
- ram
- 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 enhance the function of a micro-computer, by utilizing the terminal which provides a timing signal for accessing the external memory as a general- purpose output terminal in the state that the external memory is not connected, and by efficiently making the most of the terminal of LSI.
CONSTITUTION: In the 1 chip LSI circuit which transfers a signal between the micro-computer and the external memory is provided the output terminal 13 which gives a timing signal for commanding the write operation to the external ROM or the external RAM, or the read operation from the external part. And when a signal of the terminal 13 is in a low level, the instruction stored in ROM is written through the input terminals 3W10 and 12, subsequently the instruction address of a signal which is read out in ROM is provided to ROM through the output terminals 26W37 of LSI, and the instruction is read out by commanding a desired address. And the terminal 13 changes its output level to a high level or a low level by the command from ROM or RAM, and is made a general-purpose output terminal in the state that ROM or RAM is not connected.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4381879A JPS55135960A (en) | 1979-04-10 | 1979-04-10 | Micro-computer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4381879A JPS55135960A (en) | 1979-04-10 | 1979-04-10 | Micro-computer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55135960A true JPS55135960A (en) | 1980-10-23 |
Family
ID=12674316
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4381879A Pending JPS55135960A (en) | 1979-04-10 | 1979-04-10 | Micro-computer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55135960A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS583054A (en) * | 1981-06-30 | 1983-01-08 | Nec Corp | Single chip microcomputer |
JPS6246361A (en) * | 1985-08-23 | 1987-02-28 | Hitachi Ltd | Data processor |
US5497482A (en) * | 1985-08-23 | 1996-03-05 | Hitachi, Ltd. | Data processor in which external sync signal may be selectively inhibited |
-
1979
- 1979-04-10 JP JP4381879A patent/JPS55135960A/en active Pending
Cited By (4)
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 | |
JPS6246361A (en) * | 1985-08-23 | 1987-02-28 | Hitachi Ltd | Data processor |
US5497482A (en) * | 1985-08-23 | 1996-03-05 | Hitachi, Ltd. | Data processor in which external sync signal may be selectively inhibited |
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