C/C++ Users Group Library 1996 July/C-C++ Users Group Library July 1996.iso/vol_300/335_02/as8048.txt

Text File | 1990-12-02 | 10KB | 529 lines

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       A.  Appendix_for_as8048_Frankenstein_Assembler

       A.1  Pseudo_Operations

       A.1.1  Standard_Pseudo_Operation_Mnemonics

            End                                END
            File Inclusion                     INCL INCLUDE
            If                                 IF
            Else                               ELSE
            End If                             ENDI
            Equate                             EQU
            Set                                SET
            Org                                ORG
            Reserve Memory                     RESERVE RMB
            Define Byte Data                   BYTE DB FCB
            Define Word Data                   DW FDB WORD
            Define String Data                 FCC STRING
            Define Character Set Translation   CHARSET
            Define Character Value             CHARDEF CHD
            Use Character Translation          CHARUSE

       A.1.2  Machine_Dependent_Pseudo_Operations

       A.1.2.1  Instruction_Set_Selection

            CPU string

       The instruction set can be specified in the source file with
       the CPU pseudooperation.  The string, delimited by quotes or
       apostrophes, is scanned for a substring which selects which
       instruction set is used.  When the program is invoked, this
       operation is performed on the name of the program, then the
       -p optional arguement, if any, and then any CPU statements.
       The last one selects which subset of the instructions the
       assembler will accept.  The instruction set can be changed
       at any place in the source file.

            Instruction Set          Substrings
            80C48                    C48 c48 C35 c35
            80C49                    C49 c49 C39 c39
            80C50                    C50 c50 C40 c40
            8048                     48 35
            8049                     49 39
            8050                     50 40
            8041                     41
            8042                     42

       A.1.2.2  Register_Set













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            Label REGISTER expr

       The REGISTER statement is a version of the SET statement
       that checks that the value of its expression is a valid data
       register location for the current CPU selection.  The
       REGISTER statement sets the symbol specified in the label
       field with the numeric value of the expression.  The
       REGISTER statement can change the value of a symbol, but
       only if the symbol is originally defined in a previous SET
       or REGISTER statement.

            Example

            dtabl   register        32

                    mov     r1, #dtabl
                    mov     a, @r1

       A.2  Instructions

       A.2.1  Instruction_List

       Opcode   Syntax                  Selection Criteria


       ADD       A ',' '#' expr
       ADD       A ',' '@' REG
       ADD       A ',' REG

       ADDC      A ',' '#' expr
       ADDC      A ',' '@' REG
       ADDC      A ',' REG

       ANL       A ',' '#' expr
       ANL       A ',' '@' REG
       ANL       A ',' REG
       ANL       BUS ',' '#' expr       INSTNOT41
       ANL       P1 ',' '#' expr
       ANL       P2 ',' '#' expr

       ANLD      P47 ',' A

       CALL      expr

       CLR       A
       CLR       C
       CLR       F0
       CLR       F1














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       Opcode   Syntax                  Selection Criteria

       CPL       A
       CPL       C
       CPL       F0
       CPL       F1

       DA        A

       DEC       A
       DEC       REG

       DIS       I
       DIS       TCNTI

       DJNZ      REG ',' expr

       EN        DMA                    INST41
       EN        FLAGS                  INST41
       EN        I
       EN        TCNTI

       ENT0      CLK                    INSTNOT41

       HALT                             INSTIDL

       IDL                              INSTIDL

       IN        A ',' DBB              INST41
       IN        A ',' P1
       IN        A ',' P2

       INC       '@' REG
       INC       A
       INC       REG

       INS       A ',' BUS              INSTNOT41

       JB0       expr

       JB1       expr

       JB2       expr

       JB3       expr

       JB4       expr

       JB5       expr













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       Opcode   Syntax                  Selection Criteria


       JB6       expr

       JB7       expr

       JC        expr

       JF0       expr

       JF1       expr

       JMP       expr

       JMPP      '@' A

       JNC       expr

       JNI       expr                   INSTNOT41

       JNIBF     expr                   INST41

       JNT0      expr

       JNT1      expr

       JNZ       expr

       JOBF      expr                   INST41

       JT0       expr

       JT1       expr

       JTF       expr

       JZ        expr

       MOV       '@' REG ',' '#' expr
       MOV       '@' REG ',' A
       MOV       A ',' '#' expr
       MOV       A ',' '@' REG
       MOV       A ',' PSW
       MOV       A ',' T
       MOV       A ',' REG
       MOV       PSW ',' A
       MOV       STS ',' A
       MOV       T ',' A













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       Opcode   Syntax                  Selection Criteria

       MOV       REG ',' '#' expr
       MOV       REG ',' A

       MOVD      A ',' P47
       MOVD      P47 ',' A

       MOVP3     A ',' '@' A

       MOVP      A ',' '@' A

       MOVX      '@' REG ',' A          INSTNOT41
       MOVX      A ',' '@' REG          INSTNOT41

       NOP

       ORL       A ',' '#' expr
       ORL       A ',' '@' REG
       ORL       A ',' REG
       ORL       BUS ',' '#' expr       INSTNOT41
       ORL       P1 ',' '#' expr
       ORL       P2 ',' '#' expr

       ORLD      P47 ',' A

       OUT       DBB ',' A              INST41

       OUTL      BUS ',' A              INSTNOT41
       OUTL      P1 ',' A
       OUTL      P2 ',' A

       RET

       RETR

       RL        A

       RLC       A

       RR        A

       RRC       A

       SEL       MSELC                  INSTNOT41
       SEL       RSELC

       STOP      TCNT














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       Opcode   Syntax                  Selection Criteria

       STRT      CNT
       STRT      T

       SWAP      A

       XCH       A ',' '@' REG
       XCH       A ',' REG

       XCHD      A ',' '@' REG

       XRL       A ',' '#' expr
       XRL       A ',' '@' REG
       XRL       A ',' REG

       A.2.2  Operands

            REG                 REG can be any of r0, r1, r2, r3,
                                r4, r5, r6, r7, unless proceeded by
                                a '@' where only r0, and r1 are
                                accepted.

            MSELC               MSELC represents the symbols mb0
                                and mb1.

            RSELC               RSELC represents the symbols rb0
                                and rb1.

            P47                 P47 represents the symbols p4, p5,
                                p6, p7.

       There are uppercase versions of all the reserved symbols.

       A.2.3  Selection_Criteria_Keywords

            INSTIDL             The instruction is only available
                                on CMOS implementations.

            INSTNOT41           The instruction is not available in
                                the 8041.

            INST41              The instruction is only available
                                in the 8041.

       A.2.4  Apostrophes  The apostrophes in the syntax