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Everything posted by ealdaz

  1. Thank you all for your replies, this is very helpful information and exactly what i was after... I will digest it all carefully. It does seem on first light that the conclusion is (as per GeekDoc and RobG) that the MSP430 will wake up very quickly when using the internal DCO, and that when using an external Xtal, it has to wait for it to stabilise (order of ms) as it doesn't have a special "magic mode" that accelerates the process. Again thank you all!
  2. One of the great things of these technical forums is that eventually you can get very helpful answers, however unfortunately very often one has to put up with a fair few thoughtless replies in the process, many on the lines of read the f... manual... which obviously is a very enlightened hint... it's a shame when we do not give people the benefit of the doubt and assume they are stupid and/or lazy... and at the same time we don't bother to try to understand the question... On the other hand Kudos to those that have kept the thread positive and useful, much appreciated, this is what makes forums worth while... Anyway, moving on.. I don't have a particular MSP430 in mind, in fact i suspect that the start up times are probably much the same for all the members of the family... so if anyone is familiar with a particular model and can share the startup up times i'd be happy to hear about it. I had established from the datasheet that the startup times when using DCO was in the order of us, and what i was hoping to find out was what the startup times were when using other clock sources. Again, the purpose of my question is not to find out what clock sources are available for the MSP430, but to know the relationship between wakeup times (after being sent into the different sleep modes) and clock sources. Accuracy and startup times are not really related, the startup time is dependent on how long it takes for the oscillator to stabilise, that's why in principle one would expect an RC oscillator to be much faster starting up than a crystal... but maybe the MSP430 has some tricks up its sleeve and somehow accelerates the process... which is what I'm hoping to establish. OCY, could let me know in what datasheet or application note you've found that information please? i think it could be a very useful starting point. Again, thanks to those that have given positive feedback
  3. Could you be a bit more forthcoming please? I have read the datasheet and i don't doubt it is there, but i haven't been able to find it, so any indication such as keyword, title of topic that I should be looking for would be much appreciated. Thx
  4. Dear All I am evaluation the MSP430 for a low power application. One of the key points for the application is a quick wake up time from deep sleep mode, where the CPU clock is stopped. I have seen the MSP430 seems to have very fast wake up time from deep sleep, in the order of us, I have not been able to ascertain if this is only when running the DCO as the source of CPU clock, or if it is applicable also when the CPU clock source is an external crystal. Other architectures can also wake up relatively quickly when using the internal RC oscillator as a clock source, but take in the order of ms when using an external xtal. I am quite keen to know if this applies also for the MSP430. Any feedback welcome
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