At mega 16 or Atmega32 have 3 timeri.e.timer0, 1, 2.

Timer 0 and Timer 2 are 8-bit, whiletimer 2 is 16-bitwide. Eachtimer have their own TCCR (Timer/counter control register) for controlling different mode and clkprescaling.Also eachtimer have their own flag (overflow etc. flag’s).All timer share common register (TIFR) for their flag’s.

• TCNTn      (TCNTn register is a counter)              
• TCCRn(Timer/counter control register)             where n=0,1,2
• TIFR          (Timer interrupt flag register)
• OCRn        (Output compare register)

Flag’s:

• TOVn   (Timmer overflow flag)
• OCFn    (output compare flag)

TIFR is common for all avr  timer .

 

2) Timer 0:

• TCCR0    (Timer/counter control register for timer 0).

 

3)Timer 1:

Timer1 is a 16-bit timer and it is split into two bytes, TCNT1L (Timer1 low byte) and TCNT1H (Timer1 high byte).Timer counter have two control register and it’s has 16different modes. Also timer 0 have two OCR which are 16-bit wide.  There are two separate flags for each of of Timer1 OCR registers, which act independently of each other.

• TCNT1L          (Timer 1 low-byte)
• TCNT1H         (Timer 1 High-byte)
• TCCR1A          (Ist control register 8-bit)
• TCCR1B          (2^nd control register 8-bit)
• OCR1A            (Ist Output compare register  16-bit  )
• OCR1B            (2^nd  Output compare register  16-bit  )
• ICR1                 (Input capture register 16-bit)