Another smartpin question

Comments

• jmg Posts: 15,148

  2019-12-16 20:44

  CRST1 wrote: »

  Can someone please clarify the setup of the pin sensitivity. The doc states:

  Y[1:0] establishes A-input high/rise/edge sensitivity:
  %00 = A-input high
  %01 = A-input rise
  %1x = A-input edge

  
  What is the definition for the rise and edge difference?
  Is the rise when the low to high threshold is reached and the edge when the signal starts to rise after falling?
  

  
  I think A-input edge here means any/either/both edges ( =\_ or _/= ) whilst input rise is just _/=
• evanh Posts: 15,209

  2019-12-16 23:34

  Yep, one edge vs both edges.
  
• CRST1 Posts: 103

  2019-12-17 01:57

  Ok, so then the high is when the signal goes above the low-high threshold voltage.
  Is that correct?
• evanh Posts: 15,209

  2019-12-17 03:20

  Yep.
  
• evanh Posts: 15,209

  2019-12-17 03:51 edited 2019-12-17 04:02

  There is similar options for the SEx events too. Chip has used the word "changes" instead of edge but the others are a match.

  %001_PPPPPP = INA/INB bit of pin %PPPPPP rises
  %010_PPPPPP = INA/INB bit of pin %PPPPPP falls
  %011_PPPPPP = INA/INB bit of pin %PPPPPP changes
  %10x_PPPPPP = INA/INB bit of pin %PPPPPP is low
  %11x_PPPPPP = INA/INB bit of pin %PPPPPP is high
  

  EDIT: The smartpins don't need all the combinations internally because the %AAAA_BBBB_FFF logic input block between the custom pin circuit and the smartpin contains optional inversions to make a low into a high.