I would like to make some code tmr0 and int(RB0) interrupt

Now we just start to do PIC with MicroCode Studio program So we have problem with TMR0 and INT (RB0)TMR0 = 0

requirement:
Timer 0 interrupt every 0.27 ms

DEFINE OSC 4

OPTION_REG = %11101000
INTCON = %10110000 ' Enable RB0 & tmr0 interrupt

On Interrupt Goto Timer_0_int

Home:
IF New_ir_command = 0 THEN Home ' Wait for low going pulse



Relay = 1
led = 1
PAUSE 200
LED = 0
goto home


' timer 0 interrupt
Timer_0_int:

'...........

TMR0 = $00
resume
enable


'* int RB0

Int0_int:
.............

porta.0= 1

resume

pls advise....