3 Nov
2011
3 Nov
'11
3:42 p.m.
On 3 Nov 2011 at 20:59, Tony Duell wrote:
It beats normal multipelxed LED matrix (not adding any
external
logic). But for charlieplexing to work, and not haev other LEDs turn
on, you need indivdualy-controllable 3-state outputs -- that is any of
the pins must be able to be high, low, or high-impedance, independant
of all the others.
Isn't the ability to bit-manipulate I/O pins a hallmark of most
modern small (I/O limited) microcontrollers? I thought that went
without saying.
--Chuck