Question

A hypothetical processor supports 2-address instructions and 1-address instructions. It has 32-bit instruction and 12-bit addresses. If there are 254 2 -address instructions then minimum and maximum number of 1-address instructions can be formulated respectively are :

Answer 1

option (b)


max. opcode = $2^8=256$

used opcode = 254

unused opcode = 2

1- address instruction


max. opcode = 2* $2^{12}=2^{13}=8192$

min. opcode = 1 (Atleast 1 instruction should be present to be supported).