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;********************************************************************
;* LED flasher: LED will flash with a X on/off ratio at PD6
;*
;* NOTE: delay depends in the value of X, 1 is fast, 255 is slow
;*
;* No copyright �1998 RES� * FREEWARE *
;*
;* NOTE: Connect a low current LED with a 1k resistor in serie from
;* Vdd to pin 11 of the MCU. (Or a normal LED with a 330ohm)
;*
;* RES� can be reached by email: [email protected]
;* or visit the website: http://home.wanadoo.nl/electro1/avr
;*
;* Version :1.0
;* Date :12/26/98
;* Author :Rob's ElectroSoft�
;* Target MCU :AT90S1200-12PI@4MHz
;********************************************************************
.include "1200def.inc"
rjmp RESET ;reset handle
;* Long delay
;* Register variables
.def T1 = r1
.def T2 = r2
.def temp = r19
;* Code
longDelay:
clr T1 ;T1 used as delay 2nd count
clr T2 ;T2 used as delay 3d count
delay_1:
dec T2
brne delay_1
dec T1
brne delay_1
dec temp ;temp must be preset as
brne delay_1 ; delay master count
ret
;* Resets the data direction register D
;* Defines
.equ led = 6 ;LED at PD6
;* Code
RESET:
sbi DDRD, led ;connect LED to PORTD pin 6
;* Main program
;* This part will let the LED go on and off by X
;* Register variables
.equ X = 10 ;enter delaytime X
flash:
sbi PORTD, led ;LED on
ldi temp, X ;X sec delay
rcall longDelay
cbi PORTD, led ;LED off
ldi temp, X ;X sec delay
rcall longDelay
rjmp flash ;another run
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