bitpattern to setup CTRA for negedge-mode on pin 3

StefanL38

Hi,

I would like to setup CTRA for neg-edge-mode on PIN 3 (based on pin-counting starting at 0)

How I understand the docs about counters I would use the following binary value

 ' 3         2         1
 '10987654321098765432109876543210
'%-CMODEPLL--------B__PIN---A__PIN
'%00111000000000000000000000000011

where 01110 is the countermode located in bits 30..26
PLL-mode not needed for this countermode
A-PIN 3 located in bits 5..0 as %000011

FRQA is set to 1

and then every time a high-to-low-transition on pin 3 happens PHSA should increment by 1
But it does not work. What am I doing wrong?

best regards

Stefan

Phil Pilgrim (PhiPi)

Can you show us your actual code that sets up ctra and frqa and checks phsa for increments?

-Phil

Cluso99

IIRC you also have to make pin 3 an output as in "mov outa,#3". We need to see the code.

BTW I am far from an expert with counters - so much functionality but no time to explore. Koroneko and Phil are the kings

Phil Pilgrim (PhiPi)

Actually, no, you want pin 3 to be an input, since that's the pin whose negative edges are being counted. (BTW, mov outa,#3 doesn't make pin 3 an output; mov dira, #1<<3 would do that.)

-Phil