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SREG Status Register
PC Program Counter
Rd Destination Register
Rr Source Register
K constant Value
k constant address
b bit
s bit in status register
.org - set address
.def - define register
.equ - equate variable to value
.db - data byte.
Stack
0xf000 - 0xffff
Screen Rom
0xc000 - 0xd400 Set to 128 (0x80) by 40 (0x28)
Key in
0xe000 Load from this address to get key input
GPIO
Requires root. Works with the Raspberry Pi A+,B+,2B,3B
Register bits correspond to gpio 6, 13, 19, 26, 12, 16, 20, 21
0xe100 - output
0xe101 - set direction
0xe102 - input
See examples/blink.asm
Random
0xe004 - 0xe007 Random int value every cycle
Registers
r0 - r15
X = r13:r12
Y = r15:r14
Flags - Sreg
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|
| - | T | - | S | V | N | Z | C |
[T] Transfer flag
[S] Sign flag
[V] Overflow flag
[N] Negative flag
[Z] Zero flag
[C] Carry flag
F1 - toggle display registers
F2 - clear display registers
F3 - break (quit)
F4 - stop/start execution
Based on Atmel AVR