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Hello, how configure XTAL Mhz for PIC16F877A 20Mhz

I buil this code :


asm __config 0x3ff2


//Timing settings


#pragma CLOCK_FREQ 20000000



void main(void)


 //Hardware Initialization

 disable_interrupt( GIE );

 set_bit( STATUS, RP0 );

 set_tris_a( 16 );

 set_tris_b( 0 );

 clear_bit( STATUS, RP0 );





       delay_ms( 1 );


       delay_ms( 1 );




And i have misured with Oscilloscope the delay_ms(1) -200us



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