LED Brightness using PWM

$regfile = "attiny13a.dat"
$crystal = 1000000
$hwstack = 8
$swstack = 4
$framesize = 4

Dim I As Byte
Dim D As Byte


Config Portb.0 = Output
Config Timer0 = Pwm , Prescale = 1 , Compare A Pwm = Clear Down


Do

 Restore Dta0

  For I = 1 To 16
     Read D
     Pwm0a = D
     Waitms 50
  Next I

Loop

End


Dta0:
Data 255, 250, 245, 230,215,195,150,100, 40
Data 100, 150, 195, 215, 230, 245, 250