Document Type and Number:
Japanese Patent JPH0153812
Kind Code:
B2
Abstract:
PURPOSE:To enable to variably alter a frequency division ratio without increasing components by sharing the operation of relatively low frequency for the frequency division by a microcomputer. CONSTITUTION:A frequency generated by a reference frequency oscillator 1 is inputted to the terminal CLK of a programmable counter 2, an address code is inputted from the outputs 00-07 of microcomputer 3 to the address inputs P0- P7 to determine the frequency division ratio. The direct output of the counter 2 and the output of a binary counter 4 are inputted to a selective output circuit 5. The output of the counter 4 is applied as an interrupt to the microcomputer 3. The output which is divided in frequency by the software of the microcomputer 3 is inputted to the circuit 5. The final frequency output is obtained from the circuit 5.
Inventors:
DEGUCHI TAKASHI
EJIMA YASUYUKI
TADAMATSU HIDEKAZU
EJIMA YASUYUKI
TADAMATSU HIDEKAZU
Application Number:
JP12691282A
Publication Date:
November 15, 1989
Filing Date:
July 20, 1982
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G05B19/02; H02M7/48; H03K3/72; H03K21/00; H03K23/66
Next Patent: JPH0153813