#include "aduc7060.h"

static void delay(const unsigned long length)
{
    volatile unsigned long cnt;
    
    cnt = length;
    
    while (cnt > 0) {
        cnt--;
    }
}

int main(void)
{    
T1LD = 0x80; // 32,768 clock ticks
T1CON = 0xC0; // Periodic mode, enable
// timer, 32,768 Hz clock/1
IRQEN |= 0x10; // Enable Timer1 interrupt

// source
PLLKEY1 = 0xAA; // Switch to external crystal
PLLCON = 0x02;
PLLKEY2 = 0x55;

POWKEY1 = 0x01; // Enter nap mode
POWCON0 = 0x70; //10mhz
POWKEY2 = 0xF4;

    GP0DAT = 0x04000000;            // P0.2 configured as an output. LED is turned on    

    while (1) {
        GP0DAT ^= 0x00040000;        // Complement P0.2
        delay(2000UL);
    }
    
    return 0; /* never reached */
}

To switch to an external crystal, users must follow this procedure:
1. Enable the Timer1 interrupt and configure it for a timeout period of >120 μs.
2. Follow the write sequence to the PLLCON register, setting the OSEL bits to [10] and clearing the EXTCLK bit.
3. Force the part into nap mode by following the correct write sequence to the POWCON register.
4. When the part is interrupted from nap mode by the Timer1 interrupt source, the clock source has switched to the external crystal.

Example source code

T1LD = 0x80; // 32,768 clock ticks
T1CON = 0xC0; // Periodic mode, enable timer, 32,768 Hz clock/1
IRQEN |= 0x10; // Enable Timer1 interrupt source

PLLKEY1 = 0xAA; // Switch to external crystal
PLLCON = 0x2;
PLLKEY2 = 0x55;

POWKEY1 = 0x1; // Enter nap mode
POWCON0 = 0x73;
POWKEY2 = 0xF4;

GP1CON =  BIT9;
  
  GP2CON  = BIT5 + BIT4 + BIT1 + BIT0; //Enable P2.0 & P2.1 as PWM0 & PWM5 Outputs
  PWMCON  = BIT14 + BIT8 + BIT7 + BIT6 + BIT0; //SYNC + PWMEN + /256
  
  PWM0COM0 = 0x190;
  PWM0COM1 = 0xC8;
  PWM0COM2 = 0x40;
  PWM0LEN = 0x190;

  PWMCLRI=0x00;