This is from “A Cold Warrior’s Guide to Microcontrollers” supported by C, C++ and assembly language. Programming the Freescale HCS12 1. Write a code fragment to make the even-numbered bits of Port A all inputs and the odd numbered bits all outputs. 2. Make a three-input AND gate: Write the code to make PORT A bits 0–2 all inputs and PORT B bit 1 an output, then add the code to set PORT B bit 1 if bits 0 AND 1 AND 2 of PORT A are all set, and clear the bit otherwise. Don’t forget to include the appropriate ORG statement, and loop your code so that it repeatedly tests the inputs. 3. Repeat problem 2 for a 3-input NOR gate. 4. Write the code to realize an Exclusive-OR gate (recall that A+B=A’B+AB’). (Hint: start by writing the flow chart.)
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