| 摘要 |
<p>PURPOSE:To set a microcomputer to a reset state even if a clock oscillation circuit is stopped by providing a private oscillation circuit. CONSTITUTION:An eight bit timer 3 where the clock input (b) of watchdog timer oscillation circuit 2 in a watchdog timer circuit 1 is set to be an input counts the input (b) for a prescribed number and an overflow signal (c) is outputted as a high level. A system reset signal (e) is outputted from a reset signal generation circuit 4 in accordance with the signal (c). Thus, the microcomputer can stable set to the reset state even if the clock oscillation circuit 6 stop by such constitution.</p> |
