cctech Digest, Vol 78, Issue 3
ard at p850ug1.demon.co.uk
Wed Feb 3 14:11:43 CST 2010
> Z8530. 'Nuff said.
> Well, not quite 'nuff...it's an AMAZINGLY nice chip! I've done
> quite a bit with it (both in my designs and in existing systems) and
> have always been impressed with its capabilities.
It has one gotcha that I remember. As ever, they ran out of pins on the
package, and didn't have room for a reset pin. Instead you do a hardware
reset by asserting rd/ and wr/ at the same time.
This is only a problem if you're trying to produce rd/ and wr/ from a R/W
line and you don't realise a momentaruy overlap (and the 'glitch' from
one LS TTL gate is enough) will reset the Z8530, or worse still partially
Please don't ask how I foudn that out...
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