PLL reset

[anil23]

Posted on October 31, 2005 at 04:52

PLL reset

[anil23]

Posted on October 28, 2005 at 11:54

Hi,

I'm trying to set up clocks for the STR710 on the MB 393 board using the IAR workbench. The code is as follows:

RCCU_Div2Config ( DISABLE);

RCCU_FCLKConfig ( RCCU_RCLK_2 );

RCCU_PCLKConfig (RCCU_RCLK_4);

RCCU_MCLKConfig (RCCU_DEFAULT);

RCCU_PLL1Config (RCCU_PLL1_Mul_20, RCCU_Div_4) ;

while(RCCU_FlagStatus(RCCU_PLL1_LOCK)==RESET); // looping forever

RCCU_RCLKSourceConfig (RCCU_PLL1_Output) ;

When I run this code in debug mode, the PLL status flag is always in RESET mode and never set to SET. Do I need to change something on the board to make it get out of this infinite loop?

Regards,

[ This message was edited by: iamanil on 16-02-2006 18:29 ]

[anil23]

Posted on October 28, 2005 at 12:48

Hi,

Thanks! I think that fixed my problem. I believe that the oscillator frequency is set in the 71_conf.h file and it is defined as:

#define RCCU_Main_Osc 4000000

which I understand is that the oscillator is set to 4MHz. So, the PLL input would be 4MHz, which is under its maximum operating frequency.

In my project, I wanted to let the processor run at 20 MHz and the BSPI1 should run at 4MHz. Please let me know if I’m moving on the right path.

Thanks,

[ This message was edited by: iamanil on 16-02-2006 18:29 ]