Vasile Surducan wrote:

> BTW,
> assuming you want to build it from scratch, how many IO pins will be
> necessary for a
> 7 seg clock displaying:
> dd:mm:yyyy     hh:mm:ss:tt   totaly16 digit
> where the format displayed is day:month:year  hour:minute:second:milisecond
> 
> Vasile

TWO. Clock and data.
Using 74HC595's as serial latches to drive the segments, and
a diode + RC to drive the LD pin off the clock time out.

Charlieplexing would also reduce the pin count from the usual
grid (22 pins. 11x11=121. Enough for 112 changeable LEDs in the display).


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