JPS55959A - Input-output circuit of microcomputer - Google Patents
Input-output circuit of microcomputerInfo
- Publication number
- JPS55959A JPS55959A JP7446178A JP7446178A JPS55959A JP S55959 A JPS55959 A JP S55959A JP 7446178 A JP7446178 A JP 7446178A JP 7446178 A JP7446178 A JP 7446178A JP S55959 A JPS55959 A JP S55959A
- Authority
- JP
- Japan
- Prior art keywords
- input
- output
- latch
- data
- strobe
- 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.)
- Granted
Links
Landscapes
- Microcomputers (AREA)
Abstract
PURPOSE: To relieve a load on an external circuit and also to reduce programming by making it possible to use output data latch 4 with a strobe output function as an input data latch.
CONSTITUTION: When outputting is instructed, the output data of microcomputer μCM transmitted via data bus 8 are latched to input-output terminal 11 by latch circuits 9 and 10 by signal (a) from the arithmetic control part. A strobe signal generated by delay circuit 17 and inverter 18 secures that the data have been latched to the output latch completely. For the purpose of the execution of an input instruction, the value of data input-output terminal 11 is stroed in latch circuits 9 and 10 via AND gate 19 by the strobe signal of active LOW applied to strobe input-output terminal 16. Consequently, it can be used for both output and input latches, the need of a latch circuit needed for an external circuit is eliminated to relieve a load on the external circuit, and the programming is also reduced.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7446178A JPS55959A (en) | 1978-06-19 | 1978-06-19 | Input-output circuit of microcomputer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7446178A JPS55959A (en) | 1978-06-19 | 1978-06-19 | Input-output circuit of microcomputer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55959A true JPS55959A (en) | 1980-01-07 |
JPS5750292B2 JPS5750292B2 (en) | 1982-10-26 |
Family
ID=13547905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7446178A Granted JPS55959A (en) | 1978-06-19 | 1978-06-19 | Input-output circuit of microcomputer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55959A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62266645A (en) * | 1986-05-14 | 1987-11-19 | Nec Corp | Serial interface circuit |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54152936A (en) * | 1978-05-24 | 1979-12-01 | Hitachi Ltd | Output buffer circuit |
-
1978
- 1978-06-19 JP JP7446178A patent/JPS55959A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54152936A (en) * | 1978-05-24 | 1979-12-01 | Hitachi Ltd | Output buffer circuit |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62266645A (en) * | 1986-05-14 | 1987-11-19 | Nec Corp | Serial interface circuit |
Also Published As
Publication number | Publication date |
---|---|
JPS5750292B2 (en) | 1982-10-26 |
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