Software PWM Problems

[surfer0815]

Hi! want to read the 8 Bit AD of the 12F675 an put it out as PWM with duty cyle between 0-100%.
My Programm is working well, but when AD gets 5V, I get Pulses out with 400µS Pause. But at AD 5 V it should be permanently on, without Pulses
I don´t know whats the problem.
Here Is my Programm, I attached the Scope Picture.

Define OSCCAL_1K 1 ' Calibrate internal oscillator

' Define ADCIN parameters
Define ADC_BITS 8 ' Set number of bits in result
Define ADC_CLOCK 3 ' Set clock source (3=rc)
Define ADC_SAMPLEUS 50 ' Set sampling time in uS


LED Var GPIO.0 ' LED is bit 0, PIN 7

adval var word ' Create adval to store result
i var word

ANSEL = %00111000 ' Set AN3 analog, rest digital
CMCON = 7 ' Analog comparators off

loop:
ADCIN 3, adval ' Read channel 3 to adval
i = 256 - adval
I = i * 10
Pulsout LED,adval ' Puls is 2,56 ms
Pauseus i 'cycle = 5,12ms = 195 Hz

Goto loop ' Do it forever

End

Hope, Someone could help me!