JPS6447122A - Input circuit for microcomputer - Google Patents

Input circuit for microcomputer

Info

Publication number
JPS6447122A
JPS6447122A JP20435987A JP20435987A JPS6447122A JP S6447122 A JPS6447122 A JP S6447122A JP 20435987 A JP20435987 A JP 20435987A JP 20435987 A JP20435987 A JP 20435987A JP S6447122 A JPS6447122 A JP S6447122A
Authority
JP
Japan
Prior art keywords
microcomputer
circuit
aft
terminal
channel selection
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
Application number
JP20435987A
Other languages
Japanese (ja)
Other versions
JP2609868B2 (en
Inventor
Toru Sasabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP62204359A priority Critical patent/JP2609868B2/en
Publication of JPS6447122A publication Critical patent/JPS6447122A/en
Application granted granted Critical
Publication of JP2609868B2 publication Critical patent/JP2609868B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Electronic Switches (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To obtain an input circuit without limit in a selection range by varying a DC voltage fed to an A/D converter input terminal of a microcomputer so as to eliminate the need for an input terminal or a diode for program selection. CONSTITUTION:An A/D converter input terminal 13a of a microcomputer is connected to a midpoint between resistors R1 and R2 via a switch 14 at application of power to a PLL synthesizer television receiver or the like. Then the microcomputer 13 applies A/D conversion to a prescribed current/voltage given to the terminal 13a to select a program suitable for an applied location. When a program is selected, the switch 15 thrown the terminal 13a to a position of an AFT circuit 3 and supplies a frequency division ratio data in response to the channel selection from a keyboard 14 to a programmable frequency divider 11b. Moreover, an AFT output from the circuit 3 is subject to A/D conversion and an S-shaped curve of the AFT is read to apply channel selection tuning. Thus, the input circuit is obtained, where the configuration is simplified and there is no limit in the channel selection range.
JP62204359A 1987-08-18 1987-08-18 Microcomputer input circuit Expired - Fee Related JP2609868B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62204359A JP2609868B2 (en) 1987-08-18 1987-08-18 Microcomputer input circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62204359A JP2609868B2 (en) 1987-08-18 1987-08-18 Microcomputer input circuit

Publications (2)

Publication Number Publication Date
JPS6447122A true JPS6447122A (en) 1989-02-21
JP2609868B2 JP2609868B2 (en) 1997-05-14

Family

ID=16489205

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62204359A Expired - Fee Related JP2609868B2 (en) 1987-08-18 1987-08-18 Microcomputer input circuit

Country Status (1)

Country Link
JP (1) JP2609868B2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS629833U (en) * 1985-07-04 1987-01-21

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS629833U (en) * 1985-07-04 1987-01-21

Also Published As

Publication number Publication date
JP2609868B2 (en) 1997-05-14

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees