PRT_2COL                                ͻ
     MC68000     
                                Bit assignments 
                               ͼ
  Structure of instructions:

        15              0
        ͻ
          INSTRUCTION   
        ͼ
                
        15             0
        ͻ
           EXTENSION     if necessary for instruction , source , destination .
        ͼ
                
        15             0
        ͻ
           EXTENSION     if necessary for source , destination .
        ͼ
                
        15             0
        ͻ
           EXTENSION     if necessary for source , destination .
        ͼ
                
        15             0
        ͻ
           EXTENSION     if necessary for destination .
        ͼ



   Ŀ
                                 Operation code                            
   Ĵ
    0  0  0  0  MOVEP ANDI ORI EORI BTST BCLR BSET BCHG ADDI SUBI CMPI 
    0  0  0  1  MOVE.B                                                 
    0  0  1  0  MOVE.L MOVEA.L                                         
    0  0  1  1  MOVE.W MOVEA.W                                         
    0  1  0  0  MOVEM CLR NOT LEA PEA LINK UNLK EXT SWAP               
                NEG NEGX NBCD TST NOP JMP JSR RTS RTR                  
                TRAP TRAPV CHK ILLEGAL RTE TAS RESET STOP              
    0  1  0  1  Scc ADDQ SUBQ DBcc                                     
    0  1  1  0  BSR Bcc                                                
    0  1  1  1  MOVEQ                                                  
    1  0  0  0  OR SBCD DIVU DIVS                                      
    1  0  0  1  SUB SUBA SUBX                                          
    1  0  1  0  Line A                                                 
    1  0  1  1  EOR CMP CMPA CMPM                                      
    1  1  0  0  AND EXG ABCD MULU MULS                                 
    1  1  0  1  ADD ADDA ADDX                                          
    1  1  1  0  LSL LSR ASL ASR ROL ROR ROXL ROXR                      
    1  1  1  1  Line F                                                 
   
                                 Ŀ
                                     Size    
                                 Ĵ
                                  0  0  .B 
                                  0  1  .W 
                                  1  0  .L 
                                 
                   Ŀ
                                Addressing mode             
                   Ĵ
                    0  0  0      n        Dn            
                    0  0  1      n        An            
                    0  1  0      n       (An)           
                    0  1  1      n       (An)+          
                    1  0  0      n      -(An)           
                    1  0  1      n      d(An)           
                    1  1  0      n      d(An,Rn)        
                    1  1  1  0  0  0    Abs.W         
                    1  1  1  0  0  1    Abs.L         
                    1  1  1  0  1  0  d(PC)           
                    1  1  1  0  1  1  d(PC,Rn)        
                    1  1  1  1  0  0    #k / CCR / SR 
                   

                                                s : source
                                                d : destination
                                                M : Memory


















                               ͻ
     MC68000     
                                Bit assignments 
                               ͼ
                        ͻ
   I N S T R U C T I O N S   
                        ͼ
                                   MOVE MOVEA
                                   ----------
        15          12  11       9   8       6   5       3   2       0
       Ŀ
           Op_code         n_d      Mode_d     Mode_s       n_s   
       

                                     MOVEQ
                                     -----
        15          12  11       9   8   7                           0
       Ŀ
           Op_code        Dn      0                #               
       

                                     MOVEM
                                     -----
        15          12  11  10   9       7   6   5       3   2       0
       Ŀ
           Op_code     1 Dir 0   0   1 W/L   Mode         n     
       
                            Direction:R,M/M,R

                                     MOVEP
                                     -----
        15          12  11       9   8   7   6   5       3   2       0
       Ŀ
           Op_code        Dn      1 DirW/L 0   0   1     An     
       
                                        Direction:R,M/M,R

                                    MOVE USP
                                    --------
        15          12  11                           4   3   2       0
       Ŀ
           Op_code     1   1   1   0   0   1   1   0 Dir    An     
       
                                                        Direction:An,USP/USP,An

                                  MOVE CCR/SR
                                  -----------
        15          12  11  10   9   8       6   5       3   2       0
       Ŀ
           Op_code     0  Type   0   1   1    Mode         n     
       
                          Ŀ
                            Type   
                     Ĵ
                      00  SR,d    
                      10   s,CCR  
                      11   s,SR   
                     

                           CLR NEG NEGX NBCD TST NOT
                           -------------------------
        15          12  11       9   8   7   6   5       3   2       0
       Ŀ
           Op_code       Type     0  Size     Mode         n     
       
                            Ŀ
                             Type 
                      Ĵ
                       000  NEGX 
                       001  CLR  
                       010  NEG  
                       011  NOT  
                       100  NBCD 
                       101  TST  
                      

























                               ͻ
     MC68000     
                                Bit assignments 
                               ͼ
                        ͻ
   I N S T R U C T I O N S   
                        ͼ
                      AND OR ADD ADDA SUB SUBA CMP CMPA
                      ---------------------------------
        15          12  11       9   8  7    6   5       3   2       0
       Ŀ
           Op_code        Dn_d     0   Size      Mode_s        n_s   
       Ĵ
                           Dn_s     1   Size      Mode_d_M      n_d   
                       Ĵ
                           An      W/L  1   1     Mode          n     
                       

                                      EOR
                                      ---
        15          12  11       9   8   7   6   5       3   2       0
       Ŀ
           Op_code        Dn      1  Size     Mode         n     
       

                         ANDI ORI EORI ADDI SUBI CMPI
                         ----------------------------
        15          12  11       9   8   7   6   5       3   2       0
       Ŀ
           Op_code       Type     0  Size     Mode         n     
       
                            Ŀ
                             Type 
                      Ĵ
                       000  ORI  
                       001  ANDI 
                       010  SUBI 
                       011  ADDI 
                       101  EORI 
                       110  CMPI 
                      

                              BTST BCLR BSET BCHG
                              -------------------
        15          12  11       9   8   7   6   5       3   2       0
       Ŀ
           Op_code        Dn       1  Type     Mode         n     
       
                        1   0   0   0 
                       
                                        Ŀ
                                         Type 
                                   Ĵ
                                    00  BTST 
                                    01  BCHG 
                                    10  BCLR 
                                    11  BSET 
                                   

                                      Scc
                                      ---
        15          12  11           8   7   6   5       3   2       0
       Ŀ
           Op_code          cc        1   1    Mode         n     
       
                               Ŀ
                                cc 
                        
                         0000 T    
                         0001 F    
                         0010 HI   
                         0011 LS   
                         0100 CC/HS
                         0101 CS/LO
                         0110 NE   
                         0111 EQ   
                         1000 VC   
                         1001 VS   
                         1010 PL   
                         1011 MI   
                         1100 GE   
                         1101 LT   
                         1110 GT   
                         1111 LE   
                        















                               ͻ
     MC68000     
                                Bit assignments 
                               ͼ
                        ͻ
   I N S T R U C T I O N S   
                        ͼ
                        LSL LSR ASL ASR ROL ROR ROXL ROXR
                        ---------------------------------
        15          12  11       9   8   7   6   5   4   3   2       0
       Ŀ
           Op_code         #      Dir  Size   I/R  Type       Dn     
       Ĵ
                        0   Type   Dir  1   1     Mode          n     
                       
                            Ŀ Direction:Right/Left
                             Type 
                       Ĵ            Instruction/Register:#k/Dn
                        00   AS~ 
                        01   LS~ 
                        10  ROX~ 
                        11   RO~ 
                       

                                      EXG
                                      ---
        15          12  11       9   8                   3   2       0
       Ŀ
           Op_code        Dn       1   0   1   0   0   0      Dn     
       Ĵ
                           An       1   0   1   0   0   1      An     
                       Ĵ
                           Dn       1   1   0   0   0   1      An     
                       

                                      LEA
                                      ---
        15          12  11       9   8       6   5       3   2       0
       Ŀ
           Op_code        An      1   1   1    Mode         n     
       

                                      PEA
                                      ---
        15          12  11                   6   5       3   2       0
       Ŀ
           Op_code     1   0   0   0   0   1    Mode         n     
       

                                   LINK UNLK
                                   ---------
        15          12  11                           4   3   2       0
       Ŀ
           Op_code     1   1   1   0   0   1   0   1 Typ    An     
       
                                                        Type:LINK/UNLINK

                                      EXT
                                      ---
        15       3  12  11               7   6   5       3   2       0
       Ŀ
           Op_code     1   0   0   0   1 W/L 0   0   0     Dn     
       

                                      SWAP
                                      ----
        15          12  11                               3   2       0
       Ŀ
           Op_code     1   0   0   0   0   1   0   0   0     Dn     
       

                                   ADDQ SUBQ
                                   ---------
        15          12  11       9   8   7   6   5       3   2       0
       Ŀ
           Op_code         #     Typ Size     Mode         n     
       
                                    Type: ADDQ/SUBQ

                           ADDX SUBX ABCD SBCD CMPM
                           ------------------------
        15          12  11       9   8   7   6   5   4   3   2       0
       Ŀ
           Op_code        Rn_d    1  Size   0   0 R/M    Rn_s   
       

                              MULU MULS DIVU DIVS
                              -------------------
        15          12  11       9   8   7   6   5       3   2       0
       Ŀ
           Op_code        Dn     +/- 1   1    Mode         n     
       








                               ͻ
     MC68000     
                                Bit assignments 
                               ͼ
                        ͻ
   I N S T R U C T I O N S   
                        ͼ
                        NOP RTS RTR TRAPV RTE RESET STOP
                        --------------------------------
        15          12  11                               3   2       0
       Ŀ
           Op_code     1   1   1   0   0   1   1   1   0    Type    
       
                                                               Ŀ
                                                                Type  
                                                         Ĵ
                                                          000  RESET 
                                                          001  NOP   
                                                          010  STOP  
                                                          011  RTE   
                                                          101  RTS   
                                                          110  TRAPV 
                                                          111  RTR   
                                                         

                                    JMP JSR
                                    -------
        15          12  11               7   6   5       3   2       0
       Ŀ
           Op_code     1   1   1   0   1 Typ   Mode         n     
       
                                            Type:JSR/JMP

                                    BSR Bcc
                                    -------
        15          12  11           8   7                           0
       Ŀ
           Op_code          cc                displacement          
       
                           See Scc      <>0:d.B(PC):.S       =0:d.W(PC)
                           (BT=BRA)
                           (BF:BSR)

                                     DBcc
                                     ----
        15          12  11           8   7               3   2       0
       Ŀ
           Op_code          cc        1   1   0   0   1     Dn     
       
                           See Scc
                           (DBF=DBRA)

                                      TRAP
                                      ----
        15          12  11                           4   3           0
       Ŀ
           Op_code     1   1   1   0   0   1   0   0        #       
       

                                      CHK
                                      ---
        15          12  11       9   8       6   5       3   2       0
       Ŀ
           Op_code        Dn      1   1   0    Mode         n     
       

                                    ILLEGAL
                                    -------
        15          12  11                                           0
       Ŀ
           Op_code     1   0   1   0   1   1   1   1   1   1   0   0 
       

                                      TAS
                                      ---
        15          12  11                   6   5       3   2       0
       Ŀ
           Op_code     1   0   1   0   1   1    Mode         n     
       





















                               ͻ
     MC68000     
                                Bit assignments 
                               ͼ
                          ͻ
   E X T E N S I O N S   
                          ͼ
                             MOVEM except for -(An)
                             ----------------------
        15  14  13  12  11  10   9   8   7   6   5   4   3   2   1   0
       Ŀ
        A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
       

                                MOVEM for -(An)
                                ---------------
        15  14  13  12  11  10   9   8   7   6   5   4   3   2   1   0
       Ŀ
        D0 D1 D2 D3 D4 D5 D6 D7 A0 A1 A2 A3 A4 A5 A6 A7
       

                              d(An,Rn)   d(PC,Rn)
                              -------------------
        15  14      12  11  10       8   7                           0
       Ŀ
       D/A    Rn     W/L 0   0   0           displacement         
       

                         #k.B/W   Abs.W   d(An)   d(PC)
                         ------------------------------
        15                                                           0
       Ŀ
                                      #                               
       

                                  #k.L   Abs.L
                                  ------------
        15                                                           0
       Ŀ
                                      #_High                          
       
        15                                                           0
       Ŀ
                                      #_Low                           
       
