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Jarno Lehtinen 2018-12-19 13:35:55 +02:00 committed by GitHub
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C64_4joy_adapter/README.md
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@ -4,8 +4,15 @@
```
PORTB = *ptr; // is this atomic? probably, because ptr is 6-bit pointer.
f98: e0 91 26 01 lds r30, 0x0126 ; 0x800126 <__data_end>
f9c: f0 91 27 01 lds r31, 0x0127 ; 0x800127 <__data_end+0x1>
fa0: 80 81 ld r24, Z
fa2: 85 b9 out 0x05, r24 ; 5
f98: e0 91 26 01 lds r30, 0x0126 ; 0x800126 <__data_end> // 2 clocks
f9c: f0 91 27 01 lds r31, 0x0127 ; 0x800127 <__data_end+0x1> // 2 clocks
fa0: 80 81 ld r24, Z // 1 clock
fa2: 85 b9 out 0x05, r24 ; 5 // 1 clock
```
```
mov r31, r1
mov r30, gpior2
ld r24, Z
out 0x05, r24
```