(as) M68HC11-Syntax

 
 9.22.2 Syntax
 -------------
 
 In the M68HC11 syntax, the instruction name comes first and it may be
 followed by one or several operands (up to three). Operands are
 separated by comma (`,'). In the normal mode, `as' will complain if too
 many operands are specified for a given instruction. In the MRI mode
 (turned on with `-M' option), it will treat them as comments. Example:
 
      inx
      lda  #23
      bset 2,x #4
      brclr *bot #8 foo
 
    The following addressing modes are understood for 68HC11 and 68HC12:
 "Immediate"
      `#NUMBER'
 
 "Address Register"
      `NUMBER,X', `NUMBER,Y'
 
      The NUMBER may be omitted in which case 0 is assumed.
 
 "Direct Addressing mode"
      `*SYMBOL', or `*DIGITS'
 
 "Absolute"
      `SYMBOL', or `DIGITS'
 
    The M68HC12 has other more complex addressing modes. All of them are
 supported and they are represented below:
 
 "Constant Offset Indexed Addressing Mode"
      `NUMBER,REG'
 
      The NUMBER may be omitted in which case 0 is assumed.  The
      register can be either `X', `Y', `SP' or `PC'.  The assembler will
      use the smaller post-byte definition according to the constant
      value (5-bit constant offset, 9-bit constant offset or 16-bit
      constant offset).  If the constant is not known by the assembler
      it will use the 16-bit constant offset post-byte and the value
      will be resolved at link time.
 
 "Offset Indexed Indirect"
      `[NUMBER,REG]'
 
      The register can be either `X', `Y', `SP' or `PC'.
 
 "Auto Pre-Increment/Pre-Decrement/Post-Increment/Post-Decrement"
      `NUMBER,-REG' `NUMBER,+REG' `NUMBER,REG-' `NUMBER,REG+'
 
      The number must be in the range `-8'..`+8' and must not be 0.  The
      register can be either `X', `Y', `SP' or `PC'.
 
 "Accumulator Offset"
      `ACC,REG'
 
      The accumulator register can be either `A', `B' or `D'.  The
      register can be either `X', `Y', `SP' or `PC'.
 
 "Accumulator D offset indexed-indirect"
      `[D,REG]'
 
      The register can be either `X', `Y', `SP' or `PC'.
 
 
    For example:
 
      ldab 1024,sp
      ldd [10,x]
      orab 3,+x
      stab -2,y-
      ldx a,pc
      sty [d,sp]
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