| ??? 12/17/04 15:13 Modified: 12/17/04 15:16 Read: times |
#83311 - Re: RC reset Responding to: ???'s previous message |
Problmes due to RC reset, sometimes, are not easy to diagnose even for experienced persons.
When I joined my 2nd job, the first task given to me was to make a board work. It was a BASIC-52 board which my boss had desiged for students and it was not working all times, sometimes it worked other times didn't. The problem was low RC time constant. Increasing the resistor value solved the problem. Later we added a supervisor so that beginners don't have, at least, reset problem. Prahlad said: Refer to my S-52 Learning Board available here Erik commented: I suggest you do NOT. Things with a RC reset are likely to have other "oversights". I tend to agree with Erik. It can happen, to a beginner, that local electronic shop/ store provide him 9.1K (instead of 10K, for example) and he uses it in RC reset, he will get into big trouble. Also RC reset can introduce big troubles in battery backed-up micocontroller systems. Imagine if battery gets deeply discharged, would it be get charged (using external source) so fast so that dv/dt requirement for RC is met to generate a good reset? |
