this is PBP 2.6 and 20MHZ clock, and 10 times a second tmr1 interrupt....... on interrupt routine, need to, 1) stop timer... 2) reload tmr1 counters for timing period... 3) do something ( I set a flag so next loop in basic can see if something happened) .... turn tmr1 back on and leave int... of course you have to adjust for your stuff and PBP3

Code:
include "D:\All_PIC\Project_18f2525 RTOS\A_18F2525_Setup.pbp"     'f2525 setup stuff
include "D:\All_PIC\Project_18f2525 RTOS\A_TX_RX.pbp"
output portc.2     ' LED on pin 13 of F2525
T1CON = $31        ' Prescaler = 8, TMR1ON 
BH=11 : BL=190 '...MAIN INT TIMING PRELOAD FOR TIMER1 INT = 10X/SEC
L0=0:B3=10

'''' interrupts for T1 timeout (main timing loop), etc''''''''''''''''
ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler   TMR1_INT,      _T1int,   PBP,  yes 
        INT_Handler   RX_INT,        _RCint,  PBP,  yes   
        INT_Handler   TX_INT,        _TRint,  PBP,  no
    endm
    INT_CREATE               ; Creates the interrupt processor
ENDASM

@ INT_ENABLE  TMR1_INT     ; enable Timer 1 interrupts
@ INT_DISABLE  RX_INT        ; enable RX interrupts
@ INT_DISABLE  TX_INT       ;disable tx int 
''''_________________________________________________
______'''

Code:
''''''''''''''''''''''-----END OF MAIN LOOP-------'''''''''''''''
 
''''''''''''''-----INTERRUPTS HERE----------''''''''''''''''''

'''''''T1 main''Interrupt Routine''''''''''''''''''
T1int:
T1CON.0=0	
TMR1h=bh :TMR1l=bl  'load tmr1	
FLG1 =0          
T1CON.0=1      	   
@ INT_RETURN    ;RESET FLAG FOR BASIC LOOP
				
'''-------------RCV INT ROUTINE----------------''''
RCint:
RCX=RCREG
'@ bcf RCSTA,4 
'@ bsf RCSTA,4   
'''@ CLRF CREN     ;RESET RCV overrun
'''@ SETF CREN