| 摘要 |
<p>PURPOSE:To reduce complex processing such as pulse width deciding by software by generating an external interruption only for a signal having a pulse width effective for the serial signal of remote control, etc. CONSTITUTION:The microcomputer is composed including an edge detecting circuit 3, a control circuit 4, a counter circuit 8, a comparing circuit 9, and an interruption control circuit 13. In the case of the remote output waveform of a remote control transmitting IC, when the waveform is a pulse decided as '0,' while a rising edge is detected every approximate 1.1ms under an ordinary 455kHz oscillation, the external interruption is generated once in every approximate 1.1ms, and the interruption is to be generated only in the case of the pulse decided as '0' here. Since the external interruption is never generated in the time width of an ineffective external input signal in this manner, the processing can be simplified.</p> |
