mirror of https://github.com/hsoft/collapseos.git
17 lines
605 B
Plaintext
17 lines
605 B
Plaintext
This assembler works very much like Z80 assembler (B200) so
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refer to this documentation first. Here, we document specifici-
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ties.
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All mnemonics in AVR have a single signature. Therefore, we
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don't need any "argtype" suffixes.
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Registers are referred to with consts R0-R31. There is
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X, Y, Z, X+, Y+, Z+, X-, Y-, Z- for appropriate ops (LD, ST).
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XL, XH, YL, YH, ZL, ZH are simple aliases to R26-R31.
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Branching works differently. Instead of expecting a byte to be
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written after the naked op, branching words expect a displace-
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ment argument.
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(cont.)
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