Lpc2000

For what it's worth, your code is, as I understand it, "by the book" 
as regards programming the PLL.  I haven't got it to work either but 
I AM GETTING A LOCK.  But all my timers, UART baud rates, etc. are 
all out of sync (though I HAVE reprogrammed them to match the new 
clock rate).  I've put the problem on the back burner for now...let's 
hope someone else can help...?????

--- In lpc2000@yahoogroups.com, "shridharjoshi2000" 
<shridharjoshi2000@y...> wrote:
> hi all,
> i am trying to boost the PRocessor clock to near full speed by 
> setting the PLL registers
> but PLL is not locking .
>  am i making any mistake in configuring the PLL 
> here is my pll setting code 
> 
> void SetPLLtoMaxSpeed()
> {
> 
> 
>   // set PLL multiplier & divisor.
>   // values computed from config.h
>  REG(SYSCON_PLLCFG)= 0x23;			    //where 
> 	M=4,P=2, fosc=14.7456MHz,Fcclk=58.98MHz
>  REG(SYSCON_PLLFEED) = 0xAA;                      
>  REG(SYSCON_PLLFEED) = 0x55; 
>    
>   // enable PLL
>   REG(SYSCON_PLLCON)  = 0x01;
>   REG(SYSCON_PLLFEED) = 0xAA;
>   REG(SYSCON_PLLFEED) = 0x55;
> 
>     // wait for PLL lock
>   while (!(REG(SYSCON_PLLSTAT) & 0x0400))           
>     continue;
> 
>   // enable & connect PLL
>   REG(SYSCON_PLLCON) = 0x03;
>   REG(SYSCON_PLLFEED)  = 0xAA;
>   REG(SYSCON_PLLFEED) = 0x55;
> 
>   // setup & enable the MAM
>  //MAMTIM = MAMTIM_CYCLES;
>  // MAMCR = MAMCR_FULL;
> 
>   // set the peripheral bus speed
>   // value computed from config.h
>   REG(SYSCON_VPBDIV)  = 0x02;                // set the peripheral 
> bus clock speed to processor clock
> 
> }
> 
> thanks
> 
> shridhar