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If SUBB A,R4 is executed, then actually what operation is being applied?

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If SUBB A,R4 is executed, then actually what operation is being applied?

(a) R4+A

(b) R4-A

(c) A-R4

(d) R4+A

I had been asked this question in class test.

My enquiry is from Arithmetic and Logic Instructions in chapter 8051 Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
Right answer is (c) A-R4

Explanation: SUBB command subtracts with borrow the contents of an accumulator with that of the register or some immediate value. So A-R4 is being executed.

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