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Dan,
I've got the pins soldered into the underside of the Launchpad so it plugs into a breadboard. I had huge issues w/ XOUT and XIN last summer until I removed the pins and the jumpers. Before I did that, the jitter was over 1 us which was terrible. I'm not using the TEST pin. A scope probe on that shows 100-150 mV noise bursts at the transitions on P1.6, but I'm pretty sure that's just stray pickup by the probe. A 100 nF capacitor to ground on TEST really doesn't change things. My instincts are that the jitter is caused by noise pick up at the xtal connections, but I'd love to have confirmation from someone with more experience. If it is the result of noise on the xtal lines, then it's a design limitation of the board and I'll have to live with it or use another board like the F5529
Launchpad.
I'm running Mecrisp forth, so the debugger doesn't enter into it. I can sit and change the running timer settings via a commandline terminal like God intended ;-)
Have Fun!
Reg
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Hi Reg,
I had recently worked with the same device using the FET.
Same, I wanted
the chip on a breadboard, not the launch pad. I had a pretty
rough time
with the 32k xtal while debugging. I found that the noise
from the TEST
pin was all over the XOUT, and sometimes even keeping the
clock from
running. I'd bet that without the debugger and using the
ACLK out to
check the clock will be stable. And for anyone that runs
into the clock
not running while debugging, I found that a 56pF on XOUT to
ground keeps
the TEST noise down so it works.
Best, Dan.
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Posted by: Reginald Beardsley <[email protected]>
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