ELECTRONIC CIRCUIT EQUIPPED WITH TWO OR MORE OSCILLATION CIRCUITS

摘要

PROBLEM TO BE SOLVED: To detect deviation in frequency of a sub clock oscillation circuit provided to a sub circuit with a very simple circuit configuration even when clock oscillation circuits are independently separately provided to a main circuit and the sub circuit.

SOLUTION: An electronic circuit comprising a plurality of oscillation circuits is equipped with the main circuit 1 comprising a main clock oscillation circuit 10 and the sub circuit 2 comprising a sub clock oscillation circuit 20 which is connected to the main circuit 1 through a signal transmission circuit 3. The main circuit 1 comprises a frequency detecting circuit 11 which detects deviation in the oscillation frequency of the sub clock oscillation circuit 20. The sub circuit 2 comprises a counter 24 which counts output pulses of the sub clock oscillation circuit 20. The frequency detecting circuit 11 of the main circuit 1 detects a frequency deviation in the sub clock oscillation circuit 20 by detecting a count value of the counter 24 of the sub circuit 2.

COPYRIGHT: (C)2009,JPO&INPIT