Thu Jan 6 15:55:46 EST 2011

Practical experiment.

Nothing yet.  Procrastinating...

PIC18F2620[1] with 2 digital outputs.  I have them wired up on an old
board as:


These ports can be used for TRIG inputs.  Additionally they can be
analog in, measuring cap voltage.

Alternatively, RB4-RB7 have interrupt on change, giving one interrupt
when one of the 4 changed.  These have to be distributed between the
oscillator feedback and envelope feedback.

From changed requirements[2] the TRIG/DISCH pin needs to serve as an
analog input.

[1] md5://1997353320958cc168dfb19e7e6a1a6d
[2] entry://20110107-122205