AS6811 Assembler


The following is a list of the 68HC11 registers used by AS6811: 

        a,b     -       8-bit accumulators
        d       -       16-bit accumulator <a:b>
        x,y     -       index registers


   The  following tables list all 68HC11 mnemonics recognized by
the AS6811 assembler.  The designation [] refers to  a  required
addressing  mode  argument.   The  following  list specifies the
format for each addressing mode supported by AS6811:  

        #data           immediate data
                        byte or word data

        *dir            direct page addressing
                        (see .setdp directive)
                        0 <= dir <= 255 

        ,x              register indirect addressing
                        zero offset

        offset,x        register indirect addressing
                        0 <= offset <= 255

        ext             extended addressing

        label           branch label

The terms data, dir, offset, and ext may all be expressions.  

   Note  that  not all addressing modes are valid with every in-
struction, refer to the 68HC11 technical data for valid modes.  

Inherent Instructions 

        aba             abx
        aby             cba
        clc             cli
        clv             daa
        des             dex
        dey             fdiv
        idiv            ins
        inx             iny
        mul             nop
        rti             rts
        sba             sec
        sei             sev
        stop            swi
        tab             tap
        tba             tpa
        tsx             txs
        wai             xgdx

        psha            pshb
        psh a           psh b
        pshx            pshy
        psh x           psh y

        pula            pulb
        pul a           pul b
        pulx            puly
        pul x           pul y

Branch Instructions 

        bra     label           brn     label
        bhi     label           bls     label
        bcc     label           bhs     label
        bcs     label           blo     label
        bne     label           beq     label
        bvc     label           bvs     label
        bpl     label           bmi     label
        bge     label           blt     label
        bgt     label           ble     label
        bsr     label

Single Operand Instructions 

        asla            aslb            asld
        asl a           asl b           asl d
        asl     []

        asra            asrb
        asr a           asr b
        asr     []

        clra            clrb
        clr a           clr b
        clr     label

        coma            comb
        com a           com b
        com     []

        deca            decb
        dec a           dec b
        dec     []

        inca            incb
        inc a           inc b
        inc     []

        lsla            lslb            lsld
        lsl a           lsl b           lsl d
        lsl     []

        lsra            lsrb            lsrd
        lsr a           lsr b           lsr d
        lsr     []

        nega            negb
        neg a           neg b
        neg     []

        rola            rolb
        rol a           rol b
        rol     []

        rora            rorb
        ror a           ror b
        ror     []

        tsta            tstb
        tst a           tst b
        tst     []

Double Operand Instructions 

        adca    []              adcb    []
        adc a   []              adc b   []

        adda    []      addb    []      addd    []
        add a   []      add b   []      add d   []

        anda    []              andb    []
        and a   []              and b   []

        bita    []              bitb    []
        bit a   []              bit b   []

        cmpa    []              cmpb    []
        cmp a   []              cmp b   []

        eora    []              eorb    []
        eor a   []              eor b   []

        ldaa    []              ldab    []
        lda a   []              lda b   []

        oraa    []              orab    []
        ora a   []              ora b   []

        sbca    []              sbcb    []
        sbc a   []              sbc b   []

        staa    []              stab    []
        sta a   []              sta b   []

        suba    []      subb    []      subd    []
        sub a   []      sub b   []      sub d   []

Bit Manupulation Instructions 

        bclr    [],#data
        bset    [],#data

        brclr   [],#data,label
        brset   [],#data,label

Jump and Jump to Subroutine Instructions 

        jmp     []              jsr     []

Long Register Instructions 

        cpx     []              cpy     []

        ldd     []              lds     []
        ldx     []              ldy     []

        std     []              sts     []
        stx     []              sty     []

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Last Updated: March 2021