PWM_Signal:
clr 00
clr tr2
mov tmod,#12h
mov tl2,30h
mov th2,#0FFh
mov RCAP2L,30h
mov RCAP2H,#0FFh
clr tf2
setb tr2
loop:
jnb tf2,$
clr tf2
cpl p1.4
jb 00,PWM_Signal
ljmp loop
ret