| 摘要 |
<p>PURPOSE:To prevent a noise from the processing part of a digital signal from being mixed in an analog signal converted to a digital value by stopping transmitting and receiving the digital signal by means of the converting action signal of an A/D conversion. CONSTITUTION:When a microcomputer 1 executes a necessary control based on an analog signal (a), an A/D converter 2 starts the A/D-converting action by the input of an activation instructing signal (b), and simultaneously, a condition signal (c), which is at a low level until such a time, is made into a high level. The microcomputer 1 decides whether the A/D conversion is started or not by checking the condition signal (c) inputted to an interruption port 1a, and that the A/D converter 2 starts the action is decided when the condition signal (c) is made into the high level. The action of an oscillating circuit is stopped, and peripheral functions are stopped by interrupting connections with peripheral elements. Thus, the A/D converter 2 can converts the analog signal not to contain the noise.</p> |
