1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
ddrb = 0x17
portb = 0x18
ddrd = 0x11
portd = 0x12
.section .text ; denotes code section
.global __do_clear_bss ; and setup stack pointer
.global main
main:
LDI R16, 0xff ; load r16 with 255
OUT ddrb, R16 ; make all bits of port B as output
OUT ddrd, R16 ; make all bits of port D as output
LDI R16, 1
PUSH R16 ; push R16 content to the stack
INC R16
PUSH R16 ; push the incremented value
POP R17 ; should pop the last pushed value
POP R18 ; shoul pop the previous
OUT portb, R17 ; display on port B
OUT portd, R18 ; display on port D
.end
|
