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How should bits 2 and 3 of register A be set when executing the OP2A?

Latest Updated:01/16/2006

Question:

(CPU)   Port P2 consists of only P20 and P21. How should bits 2 and 3 of register A be set when executing the OP2A instruction? And, does this also apply to port P3? [2006/01/16]

Answer:

Set them to 0 or 1. Note that when executing the IAP2 instruction, bits 2 and 3 of register A are set to 0.
The same applies to port P3. (#105579)
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