Voltage output from PIC16f628A

[mister_e]

Try this one. I don't use LCD but echo the results to the PC.

@     __CONFIG  _HS_OSC & _MCLRE_ON  &  _LVP_OFF & _WDT_OFF & _PWRTE_ON  & _BODEN_ON  
DEFINE OSC 10

CMCON = 7
PORTA = 0
PORTB = 0
TRISA = 0
TRISB = %00000010

DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
DEFINE HSER_TXSTA 24h ' Enable transmit, BRGH = 1
DEFINE HSER_SPBRG 64  ' 9600 Baud @ 0.16%
DEFINE HSER_CLROERR 1 ' Clear overflow automatically

Duty    VAR WORD      ' Duty cycle value (CCPR1L:CCP1CON<5:4>)

CCP1CON = %00001100   ' PWM mode
T2CON = %00000110     ' Turn on Timer2, Prescale=1:16

PR2 = 155             ' Set PR2 to get 1KHz out
duty = 125            ' Set duty cycle to 20%
GOSUB ChangeDuty

Loop:
    HSerIn [DEC Duty]
    IF Duty > 625 THEN
       HSEROUT ["Duty too high... MAX = 625",13,10]
       ELSE
           GOSUB ChangeDuty
           HSEROUT ["Duty=",DEC Duty,13,10]
       ENDIF
    GOTO Loop
    
ChangeDuty:
    CCP1CON.4 = Duty.0 ' Store duty to registers as
    CCP1CON.5 = Duty.1 ' a 10-bit word
    CCPR1L = Duty >> 2
    RETURN

and read the FAQ about the fuse config... i think it's your main problem.

So far, it's working here.