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Patent Searching and Data


Title:
COUNTER CIRCUIT
Document Type and Number:
Japanese Patent JP2003069420
Kind Code:
A
Abstract:

To provide a counter circuit that can reduce the power consumption while maintaining the operating frequency equal to that of a conventional synchronous counter.

The counter circuit 100 comprises a synchronous counter section 110, an asynchronous counter section 120, and a synchronization circuit section 130k. The synchronization circuit section 130k comprises a latch means 140 and a clear control signal generating circuit 150k. The latch means 140 uses a clear preparation signal outputted from the asynchronous counter section 120 to latch a frequency division signal 103 outputted from the synchronous counter section 110. The clear control signal generating circuit 150k comprises a count section 160k and a second logic circuit 170 and outputs a clear control signal 106 at a clock cycle at which the count of the counter circuit 100 reaches a prescribed second count by receiving an output signal 105 of the latch means 140 and a clock signal 101.


Inventors:
OTA NAOTO
YAMADA ARINORI
Application Number:
JP2001255868A
Publication Date:
March 07, 2003
Filing Date:
August 27, 2001
Export Citation:
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Assignee:
NEC MICROSYSTEMS LTD
International Classes:
H03K23/00; (IPC1-7): H03K23/00
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)