It sounds like a stupid question but I could not find in Coldfire V1 documentation any reference to schmitt-trigger inputs. In fact the word schmitt is not found at all. I'd like to save some schmitt ports...
Thanks for any hints,
Celso
http://www.freescale.com/files/32bit/doc/data_sheet/MCF51JM128.pdf?fpsp=1
Check the Vih and Vil figures, and Table 10 also gives:
Table 10: "DC Characteristics".
Input hysteresis; all digital inputs Vhys: 0.06 x Vdd
So now we know Freescale uses the keyword "Hysteresis", search for that and find within the first few pages:
1.3.1 Feature List
• Input/Output
— 66 GPIOs
— Eight keyboard interrupt pins with selectable polarity
— Hysteresis and configurable pull-up device on all input pins; configurable slew rate and drive strength on all output pins
Thanks TomE,
I owe U some beers.
Cheers,
Celso