In SX Microcontrollers, SX/B Compiler and SX-Key Tool, nate wrote:

When talking about TTL and CMOS in regard to I/O pins, you are really only talking about the input logic threshold values - the values at which a device will see a voltage as 'low' or 'high':
 

TTL: low<1.4V<high

CMOS:  low<Vdd/2<high

 

 

Output from the SX is as outlined in the Spec sheet is:

 

low: (max) 0.6V

high: (min) Vdd-0.7V

 

Nate

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