Sun Mar 27 18:27:45 EDT 2011
I'm thinking of using PGD as a busy indicator. This works as long as
we're careful about not driving from both sides. It's a bit
unpredictable to know what PK2 is doing; it doesn't release
immediately. Therefore it might be best to install a 1K current
limiting resistor on the PGD line.
However that's a severe limitation. I'd like this to work with just
the chip in a socket tied to a PK2.
Maybe the AUX line should be used?
Wait.. I could use the RB pullups. Pullup enabled = busy, released =
All that is to stick to 2 lines. Going to 3 lines it's probably best
to switch to I2C or SPI.
pullups configured by active low: INTCON2 RBPU
Nope... they are too weak. Only go up to about 1V?
So... If I want 2-wire, I need better timing.