Question

What are the hexadecimal bytes for the following instructions? (for 8051 MIcrocontroller)

a. MOV DPH,#84H

b. JNB ACC.0,$

c. POP DPH

d. MOV A,#'='

e. XLR A,#'S'

f. CLR C

Answer 1

a.
Since MOV direct, # intermediate type so MOV has hexadecimal byte of 075H and DPH has the hexadecimal byte of 083H and since 84H is already in hexadecimal. So, summing up 075H,083H,84H
b.
JNB has hexadecimal value 030H and ACC.0 has the 0E0H and $ is represented as 000H, so summing up 030H,0E0H,000H.
c.
Pop has an opcode of 0D0H and DPH has 083H already stated, so summing up 0D0H,083H.
d.
MOV A,#data has an opcode of 074H and the value of '=' is 03DH, so summing up produces 074H,03DH.
e.
XRL A,#data has an opcode of 064H and the value of 'S' in hexadecimal is 053H, so summing up 064H,053H.
f.
It has an opcode of 0C3H as it is a type of CLR C.

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