12 Feb
2003
12 Feb
'03
7:42 a.m.
Rumor has it that Stuart Johnson may have mentioned these words:
:-) Good Answer
<AOLUSER> Me Too!!! ;-) </AOLUSER>
PS Is the 6809 a 8 or a 16 bit CPU?
Yes.
This has been argued many times. Personally, I would go
with the width of
the accumulator(s), 8 bits for 6809, even though there are special (or
perhaps BECAUSE they are special) instructions that use the combination of
the two accumulators as one 16 bit ("D") register.
So where would that put the Hitachi 63C09? It's 6809 compatible, but in
6309 mode, it has 4 8-bit registers, combinable to 2 16-bit registers that
you can do full 16-bit arithmetic on... but wait! There's More! No, not
Ginsu Knives.....
All four registers can be combined for 32-bit math functions!
And even without using the added registers, in 6309-mode, 6809-programs run
15-20% faster on average, due to decreased clock cycle times on many
instructions...[1]
Too bad they're not still making 'em... :-( -- although I've always
wondered if their newer processors (like the SH-3<??> ) are based on it...
Laterz,
"Merch"
--
Roger "Merch" Merchberger -- sysadmin, Iceberg Computers
zmerch(a)30below.com
[1] "Makes a guy wanna say `Hot Diggity!`" -- Me