Question

The first byte of an absolute jump instruction consists of

(a) 3 LSBs of opcode and 5 MSBs of 11-bit address

(b) 5 MSBs of opcode and 3 LSBs of 11-bit address

(c) 6 MSBs of opcode and 1 LSB of 11-bit address

(d) 5 LSBs of opcode and 3 MSBs of 11-bit address

The question was posed to me in unit test.

I'm obligated to ask this question of 8051 Instruction Set -2 topic in chapter Microcontroller 8051 of Microprocessor

Answer 1

The correct option is (d) 5 LSBs of opcode and 3 MSBs of 11-bit address

The explanation is: The first byte of an absolute jump instruction consists of 5 LSBs of opcode and 3 MSBs of 11-bit address. The next byte carries the least significant 8 bits of the 11-bit address.