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Module 3: Instruction Set and Programming

20222m

What can be the oscillator period for the multiplication operation of A and B in accordance to 16-bit product especially in B:A registers?
(i) 12
(ii) 24
(iii) 36
(iv) 48

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Answer: (iv) 48

Explanation: Same as Q30 - MUL AB takes 4 machine cycles = 4×12 = 48 oscillator periods (12 clocks per machine cycle on standard 8051). Product placed in B (high byte) : A (low byte). Flags: OV set if product >255, CY cleared.

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