dynamic voltage scaling | 68HC12 | EmbeddedRelated.com

I currently run an 812A4 with a 16 MHz clock, and need an 4 MHz clock for another device. I would prefer to generate the clock inside the A4 rather than include another crystal etc. Is this possible and if so what is the 'best' way to do it? Obviously, I don't want to use interrupts cause at that rate I'd get nothing else done. Thanks in advance, Andrew Bailie [Non-text portions of this message have been removed]

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Hi. I am not a hardware designer, but still have some small knowledge, so if it helps... If you use a canned oscillator to drive the A4, I guess that you can easily divide by 4 the clock with some JK or D gates. Now within the A4, if you enable the ECLK/PE4, "Timing reference output for external bus clock (normally, half the crystal frequency)", you should get 8 MHz on PE4 (that you can still divide outside later). Check PEAR register NECLK bit. Regards, Gilles At 12:31 PM 5/19/2003, you wrote: >I currently run an 812A4 with a 16 MHz clock, and need an 4 MHz clock for >another device. I would prefer to generate the clock inside the A4 rather >than include another crystal etc. Is this possible and if so what is the >'best' way to do it? Obviously, I don't want to use interrupts cause at that >rate I'd get nothing else done. > >Thanks in advance, > >Andrew Bailie >[Non-text portions of this message have been removed] > >-------------------------------------------------------- >To unsubscribe from this group, send an email to: >To learn more about Motorola Microcontrollers, please visit >http://www.motorola.com/mcu

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Discussion Groups | 68HC12 | dynamic voltage scaling

dynamic voltage scaling - svsvenu - May 18 11:23:00 2003

Getting a fast clock signal - Andrew Bailie - May 19 5:31:00 2003

Re: Getting a fast clock signal - Gilles Blanquin - May 19 7:58:00 2003