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Clock Switching

 
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darren_gould
Guest
Clock Switching
PostPosted: Fri Dec 09, 2005 6:15 am     Reply with quote
Hallo,

I have an application that needs to switch from the internal to external clock (ECIO).

I have to start out on the internal clock (since my fuses are set to ECIO I imagine this is in clock fail mode) and program some external hardware. Once the external hardware is programmed, a 13.56 MHz clock appears (which is attached to my OSC1 pin).

I'm using a PIC16F767 and CCS Compiler 3.200.

Problem is, when I call setup_oscillator with OSC_NORMAL it then switches over to the 32 KHz internal clock - even though the 13.56 MHz clock is correctly on the OSC1 pin.

Any thoughts as to what is causing the problem.

Code:

#include <16f767.h>
#device ICD=TRUE
#ROM 0x2007 = {0x2763}
#ROM 0x2008 = {0x3FFF}

main()
{
SETUP_ADC_PORTS(NO_ANALOGS);
SETUP_ADC(ADC_OFF);                  // disable A2D
SETUP_COMPARATOR(NC_NC_NC_NC);      // default settings
SETUP_CCP1(CCP_OFF);
SETUP_CCP2(CCP_OFF);

InitHW();                    // Hardware initialisation - subroutine not shown

delay_ms(2000);
setup_oscillator(OSC_NORMAL);

.....
}
Ttelmah
Guest
PostPosted: Fri Dec 09, 2005 9:26 am     Reply with quote
Read the processor's .h file.
Note the constants for 'setup_oscillator'. Pay special attention to 'OSC_TIMER1'.

Best Wishes
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