Question

write a program to find matrix B and C multiplication using assembly on 8051 Initialization: ORG 400H MATRIXA: DB 4, 6, 8, 1, 3. 6, 9, 3, 2 ORG 410H MATRIXB: DB 2,4,7, 4, 5,7, 3, 1,1 ORG 420H MATRIXB: DB 1, 3, 4.8, 7, 5, 3,8,9 ORG 430H RESULTDB 0, 0, 0, 0, 0, 0, 0, 0, 0 ORG 440H SIGR: DB 0, 0, 0, 0,0, 0, 0, 0, 0

Answer 1

8051 matrix multiplication assembly code:

===========================================

ORG 400H
   MATRIXA: DB 4, 6,8, 1, 3, 6,9, 3, 2
ORG 410H
   MATRIXB: DB 2, 4, 7, 4, 5, 7, 3, 1, 1
ORG 420H
   MATRIXC: DB 1, 3, 4,8, 7,5, 3, 8,9
ORG 430H
   RESULT: DB 0, 0, 0, 0, 0, 0, 0, 0, 0
ORG 440H
   SIGR: DB 0, 0, 0, 0, 0, 0, 0, 0, 0
  
ORG 00H
   MOV R2,#3       ; counter for looping every row in MATRIXB
LOOP1:
   MOV R1,#3       ; counter for looping every column in MATRIXC
LOOP2:
   CLR C           ; genrate pointer to MATRIXC
   MOV A,#3
   SUBB A,R1
   MOV R4,A
  
   CLR C           ; genrate pointer to MATRIXB
   MOV A,#3
   SUBB A,R2
   MOV B,#3
   MUL AB
   MOV R3,A
  
   MOV R0,#3       ; counter for b[i,j]*c[i,j]
   MOV R5,#0       ; sum of b[i,j]*c[i,j]
LOOP3:
   MOV DPTR, #MATRIXB   ; load b[i,j]
   MOV A,R3
   MOVC A,@A+DPTR
   MOV B,A

   MOV DPTR, #MATRIXC   ; load c[i,j]
   MOV A,R4
   MOVC A,@A+DPTR
      
   MUL AB               ; b[i,j]*c[i,j]
   ADD A,R5           ; calculate sum of b[i,j]*c[i,j]
   MOV R5,A            ; store the sum
  
   INC R3               ; point to next b[i,j]
   MOV A,R4           ; point to next c[i,j]
   ADD A,#3
   MOV R4,A      
   DJNZ R0,LOOP3
   DJNZ R1,LOOP2
   DJNZ R2,LOOP1

   END