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(as.info)M68HC11-Syntax

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Syntax
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   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:
"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'