Errors with timers code for LPC2148

[Surender Reddy]

i have downloaded a timer0/intterupt code from one website, when i try to build the code using keil 4 uvision with 12MHz crystal, it is giving errors as

inttrupt.c(6): error:  #20: identifier "PLLFEED" is undefined
inttrupt.c(13): error:  #20: identifier "PLLCFG" is undefined
inttrupt.c(15): error:  #20: identifier "PLLCON" is undefined
inttrupt.c(17): error:  #20: identifier "PLLSTAT" is undefined.

Here is my code:

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Code C - [expand]
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#include "LPC214x.h"
 
 void feed()
{
   
   PLLFEED |= 0xAA;
   PLLFEED |= 0x55;
}
 
void sys_init(void)
{
   // Configure PLL0: set CCLK (processor clock) to 60Mhz. Oscillator is 12Mhz
   PLLCFG |= 0x24;            
   feed();
   PLLCON |= 0x1;             
  feed();
   while(!(PLLSTAT & (1 << 10)));    
  PLLCON = 0x3;            
   feed();
   
   MAMTIM = 3;              
   MAMCR = 0x02;            
   
   VPBDIV = 2;               
   VICProtection = 0;            
VICIntSelect = 0;         
   MEMMAP = 0x01;            
   
   SCS = 3;               
}
 
void led_blink_ISR()
{   
   FIO1PIN ^= 1 << 24;            
   T1IR = 0xff;               
   VICVectAddr = 0;
}
 
void led_blink(unsigned int ms)
{
   static int isBlinking = 0;
   
   if(ms == 0) {
      VICIntEnClr |= (1 << 5);   
      VICVectAddr9 = 0;
      VICVectCntl9 = 0;
      T1TCR = 0;               
      FIO1SET |= 1 << 24;        
      isBlinking = 0;
      return;
   }
   
   if(isBlinking) {
            T1MR0 = ms;
      return;
   }
   
        // The LED is connected to P1.24: initialize it as a GPIO:output
        FIO1DIR |= 1 << 24;
        FIO1SET = 1 << 24;
 
   // Configure timer1 to generate an interrupt at ms/2
   T1TCR = 2;                  
   T1CTCR = 0;                  
   T1PR = 30000 - 1;            
   T1MCR = (1 << 0) | (1 << 1);   
   T1MR0 = ms;                  
   
   VICVectAddr9 = (unsigned long)led_blink_ISR;
   VICVectCntl9 = 5 | (1 << 5);
   VICIntEnable |= (1 << 5);      
   
   isBlinking = 1;
   
   T1TCR = 1;                 }
 
int main (void)
{
   sys_init();
        led_blink(100);   
        
        while(1);          
}

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How to configure PLL register?
if you have codes for interrupt/timers please share it, thanks in advance