// Chapter 1 9S12C32 C programs
// Jonathan W. Valvano, 2/07/07
// This software accompanies the book,
// Embedded Microcomputer Systems: Real Time Interfacing, Second Edition
// published by Thomson Engineering, 2006



void PLL_Init(void){  
  SYNR = 0x02;
  REFDV = 0x00;   // PLLCLK = 2*OSCCLK*(SYNR+1)/(REFDV+1)
  CLKSEL = 0x00;
  PLLCTL = 0xD1;
  while((CRGFLG&0x08) == 0){ 	  // Wait for PLLCLK to stabilize.
  }  
  CLKSEL_PLLSEL = 1;  // Switch to PLL clock
}
// Program 1.1. MC9S12C32 program that increases the 4MHz E clock to 24MHz.


// MC9S12C32
#define PTT  *(unsigned char volatile *)(0x0240)
#define PTIT *(unsigned char volatile *)(0x0241)
#define DDRT *(unsigned char volatile *)(0x0242)
// Program 1.3. C definitions of an I/O port.




// MC9S12C32
    DDRT = 0x0F;
//Program 1.5. C software that initializes pins 7-4 to input and pins 3-0 to output.





	// MC9S12C32
void main(void){// make PT3-0
  DDRT = 0x0F;  // outputs
  while(1){     
    PTT = 5;    // 0101
    PTT = 6;    // 0110
    PTT = 10;   // 1010
    PTT = 9;    // 1001
  }
}
//Program 1.7. C software for the LED output system.