JPS5578322A - Input/output circuit of microcomputer - Google Patents
Input/output circuit of microcomputerInfo
- Publication number
- JPS5578322A JPS5578322A JP15152978A JP15152978A JPS5578322A JP S5578322 A JPS5578322 A JP S5578322A JP 15152978 A JP15152978 A JP 15152978A JP 15152978 A JP15152978 A JP 15152978A JP S5578322 A JPS5578322 A JP S5578322A
- Authority
- JP
- Japan
- Prior art keywords
- control signal
- inversion
- input
- output
- latch
- 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
Abstract
PURPOSE: To cause a microcomputer itself to perform switching of positive logic and negative logic of I/O without addition of external circuits and data inversion dependent upon commands for every I/O.
CONSTITUTION: In case of positive logic, a circuit is the same state as connection between data bus 1 and latch input 15 and connection between external terminal 3 and driver input 17 by inactivating inversion control signal generation part 4 by inversion control signal 14. At an output command execution time, contents of data bus 1 are sent to latch input 15 through inversion circuit 9 as they are, and latch control signal 13 is activated by command decoder part 5 to output them as latch output 16, and simultaneously, command decoder part 5 activates driver control signal 11 to send them to external terminal 3 through driver 7, and as the result, the output processing of positive logic is performed. In case of negative logic, inversion control signal generation part 4 activates inversion control signal 14.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15152978A JPS5578322A (en) | 1978-12-06 | 1978-12-06 | Input/output circuit of microcomputer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15152978A JPS5578322A (en) | 1978-12-06 | 1978-12-06 | Input/output circuit of microcomputer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5578322A true JPS5578322A (en) | 1980-06-12 |
Family
ID=15520498
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15152978A Pending JPS5578322A (en) | 1978-12-06 | 1978-12-06 | Input/output circuit of microcomputer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5578322A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6015373A (en) * | 1983-07-05 | 1985-01-26 | 三菱電機株式会社 | Controller for elevator |
-
1978
- 1978-12-06 JP JP15152978A patent/JPS5578322A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6015373A (en) * | 1983-07-05 | 1985-01-26 | 三菱電機株式会社 | Controller for elevator |
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