I had a closer look at the DO low. At the first byte of the CMD0
(0x40+0000) the card appears to send back "Illegal command".

I might be wrong and it might be irrelevant

Working through the numerous datasheets looking for references,
explanations and nuances

The power-up sequence says to keep "74 clocks" under 1ms, so
I shortened that time, which was nudging 1ms. I wonder though
if that makes a difference when the card is already powered up

http://home.clear.net.nz/pages/joecolquitt/r1_04.gif

Also, whilst searching for sdhc 74 clocks, just to see if there were
any useful hints, Google and Firefox returned a result for the pics I
posted yesterday, and quite near the top. The really odd / creepy
thing is that the result includes a snippet of my dsPIC code, which
is definitely not in the simple HTML I wrote for that page

http://home.clear.net.nz/pages/joecolquitt/google.gif
=20
>> I'm hoping the mysterious occassional click will get fixed too
>=20
> I hope not.  Can't stand not knowing the cause of problems.  ;-)

Well, truth be told, me neither

Joe


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2015.0.5751 / Virus Database: 4315/9411 - Release Date: 03/29/15

--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.