Question

What is the main function of the SBIC instruction?

(a) it is used to clear a particular bit of a port

(b) it is used to jump unconditionally

(c) it is used to skip the instruction if a particular bit of a port is zero

(d) none of the mentioned

The question was asked during an online interview.

I would like to ask this question from I/O Port Programming and Addressing Modes topic in portion AVR Microcontroller of Microcontroller

Answer 1

Right choice is (c) it is used to skip the instruction if a particular bit of a port is zero

The best I can explain: SBIC (Skip if Bit in I/O register Clear) is used to check status of bit in I/O register. If the bit mentioned in the instruction is CLEAR or LOW then the controller will skip the immediate next instruction.