ok,

erik malud you think that i come on forum just to do jokes ..i think you have no idea what kind of condition iam in these days ...deisgning software for pulse dialing..



1) example No.1

LED Blinking Code:
Logic Low = LED ON
Logic high = LED OFF

Led is connected at P1.0 with 330 Ohms Register.

Using 12 Mhz Crystal ,

you did don't mentioned how should LED blink...so here is a rough code:-

ORG OOH
SJMP MAIN

ORG 030H ;skipping the intreuppt vector address

MAIN:
CLR P1.0 ;LED GOES ON
CALL DELAY
SETB P1.0
CALL DELAY
SJMP MAIN


; Delay works on nested loop concept,
250 x200 x 5 = 250000 micro-seconds delay On and for the same time off.

DELAY:
MOV R0,#5D
L2: MOV R1,#200D
L1: MOV R2,#250D
DJNZ R2,$
DJNZ R1,L1
DJNZ R0,L2
RET
END

2) Example No.2
Running Light thing which you might have seen in the famous Knight Rider Car Tv program.


; 8 leds connected from p1.0 to p1.7 with 330 ohms
; now firstly leds will run from left to right and then right to left.
; using the same delay as above of if you say i will change it.

ORG 00H
JMP MAIN


ORG 030H
MAIN:
MOV A,#11111110B
AGAIN: MOV P1,A
RL A
CALL DELAY
CJNE A,#01111111B,AGAIN
AGAIN2:
MOV P1,A
RR A
CALL DELAY
CJNE A,#11111110B,AGAIN2
SJMP AGAIN

DELAY:
MOV R0,#5D
L2: MOV R1,#200D
L1: MOV R2,#250D
DJNZ R2,$
DJNZ R1,L1
DJNZ R0,L2
RET
END


3) You were asking for one led blink...here is the program for blink 7 leds at a time:-


ORG 00H
JMP MAIN


ORG 030H
MAIN:
MOV A,#00000000B ; ALL LEDS ON DATA
AGAIN: MOV P1,A ; 8 LEDS GOES ON
CPL A
CALL DELAY
SJMP AGAIN

DELAY:
MOV R0,#5D
L2: MOV R1,#200D
L1: MOV R2,#250D
DJNZ R2,$
DJNZ R1,L1
DJNZ R0,L2
RET
END

USING INTERRUPTS BLINKING ONE LED AFTER 50N MICRO-SECONDS:-

ORG 00H
LJMP MAIN
ORG 000BH ; TIMER 0 VECTOR ADDRESS
LED:
CPL P1.0
RETI
ORG 030H
MAIN:
MOV TMOD,#02H ; TIMER 0 RELOAD MODE
MOV TH0,#-50D ; 50 MICRO-SECONDS DELAY
SETB TR0
MOV IE,#82H ; ENABLE TIMER 0 INTERRUPT
SJMP $
END


what else i have to do to prove that iam a hard working guy and this pulse dialing is really getting on my head