| ??? 01/27/10 00:49 Read: times |
#172746 - Fact is ... Responding to: ???'s previous message |
Erik Malund said:
because these ATMEL's built-in Pierce oscillators don't work very well at such high frequencies.
... I should have remembered that some (most?) Atmel chips are badly designed (which is part of my reason for not using Arghmel - their reply to a certain post is the main one) Erik The ATMEL pirece oscillators work as well as anyone's, but those don't work well at the 3rd harmonic. Since the O/P doesn't even know the difference between a crystal and a crystal oscillator, it's safe, IMHO, to believe that he's not going into production. Hence, using an oscillator is no sin, since they generally work, while MCU's Pierce oscillators sometimes do and sometimes don't. The O/P wants something that oscillates at somewhere near 33 MHz, the point being to make it run faster than at the 11 MHz rate at which he's proven it does. Manufacturer considerations aside, and you know I have no love lost on ATMEL, if the MCU is capable of operating at 33 MHz, and you want it to run at 33 MHz, then the setup for 11 MHz will produce exatly 3x the result, speed-wise, when using 33 MHz, which, as I pointed out, he can probably find on an old PC motherboard that's lying about somewhere, as with the 11 MHz that has satisfied him that it does work as expected. ... and for your benefit, Kai, in case you read this ... it's a food fight not a foot fight, that Erik frequently wants to start ... You know ... like the 3-year-old tossing his vegetables at his syblings. RE |
