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Title:
COUNTER CIRCUIT
Document Type and Number:
Japanese Patent JPH04117727
Kind Code:
A
Abstract:

PURPOSE: To prevent the malfunction of this counter circuit by providing 2-stages of delay flip-flops generating a pulse to load an n-bit counter to the counter circuit so as to make the holding time of the counter sufficient.

CONSTITUTION: When a clock signal 4 is inputted to a control 1 and the counted value reaches all '1', a carry-out 5 goes to '1' as an output. Then the output pulse of the carry-out 5 is given to a flip-flop 2, the input is delayed at a leading edge of the clock signal 4 and a QC output 6 is outputted. Then the outputted QC output 6 is given to a 2nd delay flip-flop 3 and the QC output 6 is delayed by the leading edge of the clock signal 4. The flip-flop 3 outputs a QC output 7 rising with a delay of a half period of the clock signal 4 from the leading edge of the clock signal 4 and the QC output 7 is inputted to a LOAD terminal of the counter 1. Thus, the hold time of the counter is sufficiently taken, thereby preventing the malfunction.


Inventors:
YAMAMOTO SEIJI
Application Number:
JP23780190A
Publication Date:
April 17, 1992
Filing Date:
September 06, 1990
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H03K23/66; (IPC1-7): H03K23/66
Domestic Patent References:
JPS631115A1988-01-06
JPS5516587A1980-02-05
JPS5566141A1980-05-19
Attorney, Agent or Firm:
Kenichi Hayase



 
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