Strange problem with 'pauseus' command

[richard]

FOR PERIOD_COUNT = 1 TO 187 '20mS PERIOD
			IF PERIOD_COUNT > PULSE THEN 'MAKE LINE LOW FOR REST OF 20mS PERIOD
				SERVO = 0 'MAKE SURE SERVO SIGNAL IS NOW LOW
			ELSE
				SERVO = 1 'SERVO SIGNAL LINE HIGH FOR 1.0 OR 2.0mS			
			ENDIF
					
        NEXT PERIOD_COUNT

this for next loop takes 45us to execute when PERIOD_COUNT is a word var even without the pause, it severly limits resolution


if you do it this way the resolution is 1 uS or thereabouts

'****************************************************************
'*  Name    : hobby_servo.BAS                                   *
'*  Author  : richard                                           *
'*  Notice  : Copyright (c) 2016 [select VIEW...EDITOR OPTIONS] *
'*          : All Rights Reserved                               *
'*  Date    : 11/19/2016                                        *
'*  Version : 1.0                                               *
'*  Notes   : 12f683                                            *
'*          :                                                   *
'****************************************************************
#CONFIG
    __config _INTRC_OSC_NOCLKOUT & _WDT_OFF & _MCLRE_ON & _CP_OFF
#ENDCONFIG
DEFINE OSC 8 'LETS PBP KNOW WE WILL BE RUNNING AT 8MHZ
include "dt_ints-14.bas"
include "REENTERPBP.bas" 

'PIN DEFENITIONS
'GP2 USED TO DRIVE SERVO (SIGNAL LINE)
'GP3 USED FOR MCLR AND ICSP PROGRAMMING
'GP4 USED FOR TRIGGER INPUT
'GP5 USED FOR LED
'SET UP THE  REGISTERS
OSCCON = %01110001  '8MHZ INTERNAL CLOCK USED
CMCON0 = %00000111 'CIN PINS ARE I/O, COUT PIN IS I/O
OPTION_REG=%01010111      ;set prescaler and assign it to tmr0
define NO_WDT 1
TRISIO = %00011011 'GP5 AND GP2 ARE OUTPUTS, THE REST ARE INPUTS 
ANSEL = 0 'NO ANALOG PORTS - ALL DIGITAL
WPU = %00010000 'GP4 WEAK PULL UP ENABLED. GP3 WEAK PULL UP AUTOMATICALLY ENABLED
    'AS THE PIN IS DEFINED AS MCLR
@Timer1 = TMR1L ; map timer1 registers to a word variable
Timer1 VAR WORD EXT 
t1con=0
  
wsave   VAR BYTE    $20     SYSTEM      ' location for W if in bank0
;wsave   VAR BYTE    $70     SYSTEM      ' alternate save location for W 
                                         ' if using $70, comment wsave1-3
' --- IF any of these three lines cause an error ?? ------------------------
'       Comment them out to fix the problem ----
' -- Which variables are needed, depends on the Chip you are using -- 
wsave1  VAR BYTE    $A0     SYSTEM      ' location for W if in bank1
'wsave2  VAR BYTE    $120    SYSTEM      ' location for W if in bank2
'Wsave3  VAR BYTE    $1A0    SYSTEM      ' location for W if in bank3
' --------------------------------------------------------------------------
 
 
 

asm
INT_LIST macro
      INT_Handler   TMR0_INT,   _serv,    PBP,  yes
      INT_Handler   TMR1_INT,   _st,      PBP,  yes
      endm
      INT_CREATE
ENDASM 
'PIN ALIASES
SERVO VAR GPIO.2
TRIGGER VAR GPIO.4
LED VAR GPIO.5
                                                                                              
'VARIABLES                                                                                     
servo_t VAR word 'pulse TIME  in us
                                                                                               
SERVO = 0 'MAKE SURE NO SIGNAL                                                                                
LED = 0 'MAKE SURE LED IS OFF
@ int_enable  TMR0_INT
@ int_enable  TMR1_INT                                                                                               
MAIN:
  IF TRIGGER = 1 THEN 'CLOSE THE DAMPER
   servo_t = 2000 '2.0mS PULSE TO SERVO
   LED = 1 'TURN ON LED
  ELSE 'OPEN THE DAMPER 
   servo_t = 1000'1.0mS PULSE TO SERVO
   LED = 0 'TURN OFF LED
  ENDIF
 goto main                                                                                  
END
 
serv:
tmr0=tmr0+100

Timer1 = -servo_t
pir1.0=0
t1con=$11
SERVO =1 
   
@ int_return
 
 
st:
t1con=0
servo=0
@ int_return