[SOLVED] Timer0 at89c2051 problem

[pratzz]

clr p3.1
mov p1,#0ffh
start:


Here1:	
	Cpl p3.1
	mov r2,#80
	sjmp there1

there1:
Mov r1,#5
acall delay
djnz r2,there1
sjmp here1 

delay:
Mov tmod,#01
mov tl0,#0f6h
mov th0,0c2h
setb tr0
again:jnb tf0,again
clr tr0
clr tf0
djnz r1,delay
ret
end

in simulation i have connected led to port 3.1 but it is not blinking.

 

[dean_winchester]

then you should complement the P3.7 not theP3.1 that you are doing in code.

 

[pratzz]

no that was not the mistake , i meant 3.1 only ,sorry for that

 

[IanP]

Without analizing your code, hardwarewise, how did you connect the LED?
[C] to the CPU pin and [A] {through a resistor} to Vcc?
Keep in mind that there is nothing to drive a load connected between a pin and GND ...

:wink:
IanP

 

[pratzz]

p-side to port and n side to ground,do we require pull ups in 2051?i have never used it before.