|Red Hat Enterprise Linux 3: Using as, the Gnu Assembler|
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The macro syntax used on the MSP 430 is like that described in the MSP 430 Family Assembler Specification. Normal as macros should still work.
Additional built-in macros are:
Extracts least significant word from 32-bit expression 'exp'.
Extracts most significant word from 32-bit expression 'exp'.
Extracts 3rd word from 64-bit expression 'exp'.
Extracts 4rd word from 64-bit expression 'exp'.
They normally being used as an immediate source operand.
mov #llo(1), r10 ; == mov #1, r10 mov #lhi(1), r10 ; == mov #0, r10
; is the line comment character.
The character $ in jump instructions indicates current location and implemented only for TI syntax compatibility.
General-purpose registers are represented by predefined symbols of the form rN (for global registers), where N represents a number between 0 and 15. The leading letters may be in either upper or lower case; for example, r13 and R7 are both valid register names.
Register names PC, SP and SR cannot be used as register names and will be treated as variables. Use r0, r1, and r2 instead.