Title:
ELECTRONIC CLOCK DEVICE AND METHOD AND DEVICE FOR CORRECTION VALUE DECISION DEVICE
Document Type and Number:
Japanese Patent JPH07154243
Kind Code:
A
Abstract:
PURPOSE: To correct an oscillation frequency deviation for a clock oscillation circuit without use of a trimmer capacitor.
CONSTITUTION: The device is provided with a nonvolatile correction memory 21 storing a correction value ΔM, a correction timing counter 22 using a clock oscillation circuit 9 for a count source to generate a correction timing, and a reference clock generating circuit 23 using the clock oscillation circuit 9 for a count source to generate a time count reference signal. The frequency division ratio of the reference clock generating circuit 23 is controlled by the correction value stored in the correction value memory 21. Thus, the oscillation frequency deviation of the clock oscillation circuit 9 is corrected.
Inventors:
SUZUKI YUTAKA
ISHIDA TAKUMI
HAYAKAWA MASAHARU
ISHIDA TAKUMI
HAYAKAWA MASAHARU
Application Number:
JP29809093A
Publication Date:
June 16, 1995
Filing Date:
November 29, 1993
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
G04G3/02; H03K23/66; (IPC1-7): H03K23/66
Attorney, Agent or Firm:
Takada Mamoru