JPS57170626A - Converting circuit - Google Patents
Converting circuitInfo
- Publication number
- JPS57170626A JPS57170626A JP56055834A JP5583481A JPS57170626A JP S57170626 A JPS57170626 A JP S57170626A JP 56055834 A JP56055834 A JP 56055834A JP 5583481 A JP5583481 A JP 5583481A JP S57170626 A JPS57170626 A JP S57170626A
- Authority
- JP
- Japan
- Prior art keywords
- converter
- port
- switch
- outputted
- analog
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/02—Reversible analogue/digital converters
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Microcomputers (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
PURPOSE:To use parts, which are used for an A/D and a D/A converter, in common and to decrease the number of the parts by using an I/O port, a buffer and a resistance ladder for the D/A converter when they are not used for the A/D converter. CONSTITUTION:This converting circuit normally operates as a D/A converter. In this case, the port 111 of an I/O port 11 has a level LOW, an analog switch 24a is cut off, and an analog switch 24b is closed. Therefore, digital data outputted from the port 11 is passed through a buffer 12 and a resistance ladder to be converted into analog data, which is outputted to a terminal 131 and then applid to an integrating circuit 26 as a sample holding circuit through the switch, so that it is outputted to an analog data output terminal 271 through a voltage follower circuit 27. When a computer requires the analog data, the port 11 is held at a high level to turn the switch 24a on and to turn the switch 24b off. Consequently, the converting circuit operates as an A/D converter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56055834A JPS57170626A (en) | 1981-04-14 | 1981-04-14 | Converting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56055834A JPS57170626A (en) | 1981-04-14 | 1981-04-14 | Converting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57170626A true JPS57170626A (en) | 1982-10-20 |
Family
ID=13010003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56055834A Pending JPS57170626A (en) | 1981-04-14 | 1981-04-14 | Converting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57170626A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63199352U (en) * | 1987-06-10 | 1988-12-22 | ||
JPH0897721A (en) * | 1994-09-28 | 1996-04-12 | Nec Corp | Ad/da converter |
-
1981
- 1981-04-14 JP JP56055834A patent/JPS57170626A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63199352U (en) * | 1987-06-10 | 1988-12-22 | ||
JPH0897721A (en) * | 1994-09-28 | 1996-04-12 | Nec Corp | Ad/da converter |
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