8 Dec
2007
8 Dec
'07
5:35 p.m.
On 8 Dec 2007 at 19:44, M H Stein wrote:
That is not feasible. I need 7 or 9 decades of
count/decode, and I happen
to have an abundance of GALs and a GAL programmer. If it comes down to a
CPLD-design, I'll probably throw in the towel and use an AVR microcontroller
and perhaps a real 74LS47 or 74LS247 to lower the I/O requirements a touch.
Any need to have a separate decoder for each digit? I wonder if an
alternate approach of using a single BCD-to-7 decoder, multiplexing
the displays and simply concentrating on the counting end.
Just a thought--certainly if I were running this with a PIC or an
AVR, I'd definitely give it some thought.
Cheers,
Chuck