[Coco] Questions about the Coco3 GIME Timer
gene.heskett at verizon.net
Wed Feb 14 09:30:22 EST 2007
On Wednesday 14 February 2007, Robert Gault wrote:
>Gene Heskett wrote:
>>>Two speeds, either 279.4 nsec (1/8 crystal speed = color burst) or 63
>>>usec. The service manual is incorrect claiming 70 nsec for the fast
>> Even at 63 usec's, that's a wee bit too fast to use for generating
>> interrupts that in turn would count down according the the programmed
>> stepper speed and finally issue the step change.
>Well that's the clock rate at slow speed, which is what you asked to
>have. Since the timer is 12-bit, you can set the interrupt at slow speed
>for anything from 63 usec to 0.26 sec (4096x63).
The point is, that to drive a milling machine, we would need one of these
per axis being moved. That's at least 2 just to cut circuit boards...
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