| 摘要 |
<p>PURPOSE:To assuredly designate the working mode of a microprocessor, by applying the reset signal to a terminal of an A/D converter via a diode. CONSTITUTION:A pin P20 of a microprocessor muCPU is connected to an output terminal EOC of an A/D converter ADC. The time width of the output signal of the converter ADC is measured by a timer TIM, etc. of the processor muCPU after the designation of the working mode. A reset signal (rst) is applied to a terminal ST of the converter ADC to which a start signal is applied from the processor muCPU via a diode D4 so that the terminal ST is set at a low level when the signal rst is at a low level. Thus the output signal of the converter ADC is set at a high level when the working mode is designated. In such a way, the working mode is designated.</p> |
