In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

What is the best way to approach in design using an SX-28 to replace some logic chips (e.g. 74HC00 NAND, 74HC32 OR and a 74HC138 3/8 Decoder). Would making up a truth table of the possible inputs and outputs and then simplify it through Kanough mapping be the best approach. I want to use an SX-28 to replace a few chips. Should I use the logic statement or simply use a bunch of IF THEN statements to the pins on the SX-28 (Inputs and Outputs) as "individual" chips. Hopefully you can follow what I am saying. 
 

Summary:

 

Choice A: Through the use of IF THEN statements (e.g. If RA.0 is HIGH AND RA.1 is HIGH THEN RA.2 is LOW, ect..) within an SX-28, create code to emulate per say individual logic chips and then connect them together with wires externally to the SX-28 (e.g. SX-28 RA.0 and RA.1 are inputs to a NAND and RA.2 is the output)

 

Choice B: Use Karnough mapping to make one master logic statement using various SX-28 I/O pins to emulate this.  

 

I'm thinking that I may have to use Choice B due to the limited amount of pins on the SX-28. 

 

Does anyone know where I can get a good reference to Karnough mapping as I haven't used it in 10 years since college?

 

Thanks.

 

Thoughts and Comments?

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