AVR-Chat

Here is some code for initializing timer0 

  /*
   * Initialize timer0 to use the 32.768 kHz real-time clock crystal
   * attached to TOSC1 & 2.  Enable output compare interrupt and set
   * the output compare register to 32 which will cause an interrupt
   * to be generated every 0.9765625 milliseconds - close enough to a
   * millisecond. 
   */
  TIFR  |= BV(OCIE0);
  TIMSK |= BV(OCIE0);    /* enable output compare interrupt */
  ASSR  |= BV(AS0);      /* use asynchronous clock source */
  TCNT0  = 0;
  OCR0   = MS_OCRMATCH;     /* non debug use 32 match in 0.9765625 ms */
  TCCR0  = BV(WGM01) | BV(CS00); /* CTC, no prescale */
  
  while (ASSR & 0x07)
    ;

Then I use a interupt routine 

 */
SIGNAL(SIG_OUTPUT_COMPARE0)
{
ms_count++;
}



-----Original Message-----
From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On
Behalf Of ttse7
Sent: Monday, May 30, 2005 4:38 AM
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] Atmega16 Real time clock


Hi all,

I cannot turn on the real time clock of atmega16, I am sure I put the
32K crystal at TOSC1 and TOSC2, here is a portion of my source code:

....
ASSR |= _BV(AS2);
TCCR2 =0x05;
TCNT2 =0x00;
....
sei();

Can anyone help? Many thanks


















 
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