how to use the internal comparator in pic16f877a??

[texas5]

@ DEVICE pic16F877a, INTRC_OSC_NOCLKOUT
' System Clock Options
@ DEVICE pic16F877a, WDT_ON
' Watchdog Timer
@ DEVICE pic16F877a, PWRT_ON
' Power-On Timer
@ DEVICE pic16F877a, MCLR_OFF
' Master Clear Options (Internal)
@ DEVICE pic16F877a, BOD_ON
' Brown-Out Detect
@ DEVICE pic16F877a, LVP_OFF
' Low-Voltage Programming
@ DEVICE pic16F877a, CPD_OFF
' Data Memory Code Protect
@ DEVICE pic16F877a, PROTECT_OFF
' Program Code Protection

BatVal var CMCON.7

BatLoLED var PORTB.7

CMCON=%00100101


VRCON=%11101100

Pauseus 10

TRISA=%11111111
TRISB=%00000000

BatLoLoop:
BatLoLED=BatVal

Goto BatLoLoop

End

my vref=4v, vin=3.6 and my vout=9v.can someone help me which part of the coding need to be edit.please...

[skimask]

my vref=4v, vin=3.6 and my vout=9v.can someone help me which part of the coding need to be edit.please...

Vref = 4v - what is Vref connected to?
Vin = 3.6v - what is Vin connected to?
Vout = 9v - what is Vout connected to?

Read the datasheet for the 16F877A!
Can MCLR be turned off?
How many oscillator modes does the 16F877A have? What are they?