MOV R0, #LOW(1025)
MOV R1, #HIGH(1025)
MOV R2, #LOW(1024)
MOV R3, #HIGH(1024)
MOV A, R0
MOV B, R2
MUL AB
MOV R4, A
MOV R5, B

MOV  A, R0
MOV  B, R3
MUL AB
ADDC A, R5
MOV R5, A
MOV A, B
ADDC A,#00H
MOV R6,A
MOV A, R1
MOV B,R2
MUL AB
ADDC A, R5
MOV R5, A
MOV A,B
ADDC A, R6
ADDC A,#00H
MOV R6, A
MOV A, R1
MOV B,R3
MUL AB
ADDC A, R6
ADDC A,#00H
MOV R6, A
MOV A,B
ADDC A,#00H
MOV  R7, A