Re: Problems are about the MPC566's CLOCK

  Thank you! 
  The associated clock circuitry as you indicated is the same to the 
MPC566EVB. I did not use the MC33394, this is different to the 
MPC566EVB in the power, reset and clock circuit.MODCLK is 010.
  Yestoday, I wrote a simple programe with MPC500_Quick_Start's API, 
to set the SCCR and PLPRCR, then use two variables circularly read 
the value of these two registers. 

UWord32 clkReg;
UWord32 pllReg;
void main(void)
{
   clkReg=0x00000000;
   pllReg=0x00000000;
   ioctl( USIU, USIUCLK_WRITE_SYSCLK_CONTROL_REG, 0x81210000L );
   ioctl(USIU,USIUCLK_WRITE_PLL_LP_RESET_CONTROL_REG,0x00900001L );
   clkReg = ioctl( USIU, USIUCLK_READ_SYSCLK_CONTROL_REG, NULL );
   pllReg = ioctl(USIU,USIUCLK_READ_PLL_LP_RESET_CONTROL_REG,NULL);
   while (1) 
    {
     clkReg = ioctl( USIU, USIUCLK_READ_SYSCLK_CONTROL_REG, NULL );
     pllReg = ioctl(USIU,USIUCLK_READ_PLL_LP_RESET_CONTROL_REG,NULL);
    }

}
  
   I found that the value of SCCR always became 0x81290000, it 
showed that the BUCS is 1. Why did it differ with the value I set? 
Why did it not be found in the MPC566EVB?  







--- In [email protected], "Dobbin Allan-r11834" 
<Allan.Dobbin@...> wrote:
>
> You have to verify not only the cycstal circuit, but also the 
associated
> clock circuitry i.e. MODCLK, Vddsyn, Xfc, etc. Make sure your 
board is
> coming out of reset.  Obviously the sysclock/clkout depend on 
values
> programmed into SCCR (EBDF allows a clkout /2 option) and MF 
withing
> PLPRCR.
>  
> 
> 	-----Original Message-----
> 	From: [email protected] 
[mailto:[email protected]] On
> Behalf Of illtll801021
> 	Sent: Thursday, June 08, 2006 11:01 PM
> 	To: [email protected]
> 	Subject: [MPC500] Problems are about the MPC566's CLOCK
> 	
> 	
> 
> 	Hi everyone:
> 	I'm puzzled by the MPC566's CLOCK. I used the Axiom 
MPC566EVB
> and 
> 	Codewarrior. I used MPC500_Quick_Start's GCT to set the 
system
> clock on 
> 	40Mhz,and the same to Clockout. I debuged it in internal 
flash
> and the 
> 	crystal oscillator is 4 Mhz. When I debuged it with the
> MPC566EVB, it 
> 	is all right. But when I debuged it with my board that the
> circuit of 
> 	crystal is same to the MPC566EVB, the Clockout output 2Mhz. 
Why?
> Please 
> 	help me! What should I do? Thanks!!!
> 	liulong
> 	
> 	
> 	
> 
> 	 
> 
> 
> 
> [Non-text portions of this message have been removed]
>







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