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ASZ80 Assembler

.hd64 DIRECTIVE 

Format:  

        .hd64 

The  .hd64  directive enables processing of the HD64180 specific
mnemonics not included in  the  Z80  instruction  set.   HD64180
mnemonics  encountered  without  the  .hd64  directive  will  be
flagged with an 'o' error.  


Z80 REGISTER SET AND CONDITIONS 


   The following is a complete list of register designations and
condition mnemonics:  

        byte registers  -       a,b,c,d,e,h,l,i,r
        register pairs  -       af,af',bc,de,hl
        word registers  -       pc,sp,ix,iy

        C -     carry bit set
        M -     sign bit set
        NC -    carry bit clear
        NZ -    zero bit clear
        P -     sign bit clear
        PE -    parity even
        PO -    parity odd
        Z -     zero bit set



L.3  Z80 INSTRUCTION SET 


  The following list specifies the format for each addressing
mode supported by ASZ80:  

        #data           immediate data
                        byte or word data

        n               byte value

        rg              a byte register
                        a,b,c,d,e,h,l

        rp              a register pair
                        bc,de,hl

        (hl)            implied addressing or
                        register indirect addressing

        (label)         direct addressing

        offset(ix)      indexed addressing with
                        an offset

        label           call/jmp/jr label

The  terms  data,  dir,  offset, and ext may all be expressions.
The terms dir and offset are not allowed to be  external  refer-
ences.  

   Note  that  not all addressing modes are valid with every in-
struction, refer to the Z80/HD64180  technical  data  for  valid
modes.  

   The  following  tables  list all Z80/HD64180 mnemonics recog-
nized by the ASZ80 assembler.  The designation []  refers  to  a
required addressing mode argument.  

Inherent Instructions 

        ccf             cpd
        cpdr            cpi
        cpir            cpl
        daa             di
        ei              exx
        halt            neg
        nop             reti
        retn            rla
        rlca            rld
        rra             rrca
        rrd             scf


Implicit Operand Instructions 

        adc     a,[]            adc     []
        add     a,[]            add     []
        and     a,[]            and     []
        cp      a,[]            cp      []
        dec     a,[]            dec     []
        inc     a,[]            inc     []
        or      a,[]            or      []
        rl      a,[]            rl      []
        rlc     a,[]            rlc     []
        rr      a,[]            rr      []
        rrc     a,[]            rrc     []
        sbc     a,[]            sbc     []
        sla     a,[]            sla     []
        sra     a,[]            sra     []
        srl     a,[]            srl     []
        sub     a,[]            sub     []
        xor     a,[]            xor     []


Load Instruction 

        ld      rg,[]           ld      [],rg
        ld      (bc),a          ld      a,(bc)
        ld      (de),a          ld      a,(de)
        ld      (label),a       ld      a,(label)
        ld      (label),rp      ld      rp,(label)
        ld      i,a             ld      r,a
        ld      a,i             ld      a,r
        ld      sp,hl           ld      sp,ix
        ld      sp,iy           ld      rp,#data

        ldd                     lddr
        ldi                     ldir


Call/Return Instructions 

        call    C,label         ret     C
        call    M,label         ret     M
        call    NC,label        ret     NC
        call    NZ,label        ret     NZ
        call    P,label         ret     P
        call    PE,label        ret     PE
        call    PO,label        ret     PO
        call    Z,label         ret     Z
        call    label           ret


Jump and Jump to Subroutine Instructions 

        jp      C,label         jp      M,label
        jp      NC,label        jp      NZ,label
        jp      P,label         jp      PE,label
        jp      PO,label        jp      Z,label

        jp      (hl)            jp      (ix)
        jp      (iy)            jp      label

        djnz    label

        jr      C,label         jr      NC,label
        jr      NZ,label        jr      Z,label
        jr      label


Bit Manipulation Instructions 

        bit     n,[]
        res     n,[]
        set     n,[]


Interrupt Mode and Reset Instructions 

        im      n
        im      n
        im      n
        rst     n


Input and Output Instructions 

        in      a,(n)           in      rg,(c)
        ind                     indr
        ini                     inir

        out     (n),a           out     (c),rg
        outd                    otdr
        outi                    otir


Register Pair Instructions 

        add     hl,rp           add     ix,rp
        add     iy,rp

        adc     hl,rp           sbc     hl,rp

        ex      (sp),hl         ex      (sp),ix
        ex      (sp),iy
        ex      de,hl
        ex      af,af'

        push    rp              pop     rp


HD64180 Specific Instructions 

        in0     rg,(n)
        out0    (n),rg

        otdm                    otdmr
        otim                    otimr

        mlt     bc              mlt     de
        mlt     hl              mlt     sp

        slp

        tst     a
        tstio   #data

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