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- ;
- ; tinyblink
- ; Blinks an LED on pin 4 (PB2)
- ;
-
- .DEVICE ATtiny10
-
- ; variables
- .EQU delayMult1 = 0xff ; the delay is delay3*delaymult2*delaymult1
- .EQU delayMult2 = 0xff
- .EQU delayMult3 = 0x0f
-
- .CSEG ; code section
- .ORG $0000 ; the starting address
- main:
- ; set up the stack
- ldi r16, high(RAMEND)
- out SPH, r16
- ldi r16, low(RAMEND)
- out SPL, r16
-
- ; set clock divider
- ldi r16, 0x00 ; clock divided by 1
- ldi r17, 0xD8 ; the key for CCP
- out CCP, r17 ; Configuration Change Protection, allows protected changes
- out CLKPSR, r16 ; sets the clock divider
-
- ; initialize port
- ldi r16, 1<<PB2 ; sets pin 4 (PB2) to putput
- out DDRB, r16 ; data direction
- ldi r16, 0x00 ; sets all pins low
- out PORTB, r16
-
- ; nop for sync
- nop
-
- loop:
- ; turn on and delay
- ldi r16, (1<<PB2)
- out PORTB, r16
- rcall delay
-
- ; turn off and delay
- ldi r16, 0x00
- out PORTB, r16
- rcall delay
- rjmp loop
-
- delay:
- ; not really needed, but keep r16-r18
- push r16
- push r17
- push r18
-
- ldi r16, delayMult1
- ldi r17, delayMult2
- ldi r18, delayMult3
-
- ; start delay loop
- delayLoop:
- subi r16, 1 ; subtract 1
- sbci r17, 0 ; if r16 was 0, subtract 1
- sbci r18, 0 ; if r17 was 0, subtract 1
- brne delayLoop ; while r18 is not 0, loop
- ; end delay loop
-
- pop r17
- pop r16
- pop r18
- ret
-
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