mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-06 02:20:58 +11:00
17 lines
616 B
Plaintext
17 lines
616 B
Plaintext
AVR assembler
|
|
|
|
This assembler works very much like Z80 assembler (B200) so
|
|
refer to this documentation first. Here, we document specifici-
|
|
ties.
|
|
|
|
All mnemonics in AVR have a single signature. Therefore, we
|
|
don't need any "argtype" suffixes.
|
|
|
|
Registers are referred to with consts R0-R31. There is
|
|
X, Y, Z, X+, Y+, Z+, X-, Y-, Z- for appropriate ops (LD, ST).
|
|
XL, XH, YL, YH, ZL, ZH are simple aliases to R26-R31.
|
|
|
|
Branching works differently. Instead of expecting a byte to be
|
|
written after the naked op, branching words expect a displace-
|
|
ment argument. (cont.)
|