assembly - PIC 16F1503 - change the frequency of internal oscillator

My configuration bits are as follows:

#include  
__CONFIG _CONFIG1, _FOSC_INTOSC & _WDTE_OFF & _PWRTE_ON & _MCLRE_OFF & _CP_OFF & _BOREN_OFF & _CLKOUTEN_OFF
__CONFIG _CONFIG2, _WRT_OFF & _STVREN_OFF & _LVP_OFF

The relevant part of code I am using for changing the frequency is this:

banksel OSCCON

movlw   b'01101000'     ; Int. osc. 4 MHz
movwf   OSCCON
btfss   OSCSTAT, HFIOFR ; Is internal oscillator running?
goto    $-1             ; No, loop one line back...
btfss   OSCSTAT, HFIOFS ; Is internal oscillator stable?
goto    $-1             ; No, loop one line back...

My debug tool is unfortunately just simulator. The problem is that execution never reaches the breakpoint on line 192:

So this means that internal oscillator never gets stable?

I am using:

• IDE: MPLAB X IDE v1.20


• Compiler: MPASM v5.45

What am I doing wrong?

Answer

If you are using the simulator, you must comment out those two tests for the oscillator running or being stable. Since you don't have any hardware running, the tests will always fail. They should be OK if you use a debugger like the PICkit 2/3 or ICD 3.