Problem with Timer Interrupt, PortB5-7 gets disabled

[jamshid.dastur]

Dear fellows, I'm trying to implement a timer which would get enabled on a specific action perfor a specific task ones the time is reached.

I've achieved the timer thing using interrupts and breaking it down furthur and keeping a check on it. But achieving so i've came accross a number of problems

1. Serin/Serout data started to messup...so used disable/enable before and after to run serial communication smoothly...

2. Data read using names symbols on PortB failed so again disable/enable and used directly like PORTB instead of variable...this solved problem with Porb.0-Portb.4

3. Now the actual problem being: I'm unable to deal with my inputs at Portb.5-Portb.7...

I'm using 18F452 with a 4MHz XTAL

The code for my interrupt and all is:


'''''''''''''''''''''DEFINING and ENABLING INTERRUPT'''''''''''''''
T0CON = %11000111
INTCON = %00100000

On Interrupt GoTo SwitchOff

GoTo ProgramInitializationCont

Disable
SwitchOff:

If CountIntTimer < TimerInSMS Then
CountIntTimer = CountIntTimer + 1
INTCON.2 = 0
ElseIf CountIntTimer = TimerInSMS Then
CountIntTimer = CountIntTimer + 1
Power = 1 'Power Off
Else
Resume
EndIf
Resume
Enable

''''''''''''''''''''''DEFINING and ENABLING INTERRUPT FINISHED'''''''''''''''


TimeInSMS = 100

ProgramInitializationCont:

If PortA.0 = 1 then
CountIntTimer = 0
INTCON.2 = 0
endif
if PortB.7 = 1 then 'I'M NOT ABLE TO READ PORTB.5-7
'Some other action
endif

end

''''''''''''''''''END OF CODE'''''''''''''''''''''''''''''''''

An urgent solution in timers implementation and PortB reuse would be appreciated

Best Regards
JD

PS: Although the code functions well on the OshonSoft PIC18 Simulator but am NOT ABLE TO READ MY PORTB IN PHYSICAL