ATmega16 datasheet(89/357 Pages) ATMEL

89 / 357 page

2466S–AVR–05/09

ATmega16(L)

16-bit

Timer/Counter1

The 16-bit Timer/Counter unit allows accurate program execution timing (event management),

wave generation, and signal timing measurement. The main features are:

• True 16-bit Design (i.e., Allows 16-bit PWM)

• Two Independent Output Compare Units

• Double Buffered Output Compare Registers

• One Input Capture Unit

• Input Capture Noise Canceler

• Clear Timer on Compare Match (Auto Reload)

• Glitch-free, Phase Correct Pulse Width Modulator (PWM)

• Variable PWM Period

• Frequency Generator

• External Event Counter

• Four Independent Interrupt Sources (TOV1, OCF1A, OCF1B, and ICF1)

Overview

Most register and bit references in this section are written in general form. A lower case “n”

replaces the Timer/Counter number, and a lower case “x” replaces the output compare unit.

However, when using the register or bit defines in a program, the precise form must be used

(i.e., TCNT1 for accessing Timer/Counter1 counter value and so on).

A simplified block diagram of the 16-bit Timer/Counter is shown in Figure 40. For the actual

placement of I/O pins, refer to Figure 1 on page 2. CPU accessible I/O Registers, including I/O

bits and I/O pins, are shown in bold. The device specific I/O Register and bit locations are listed

in the “16-bit Timer/Counter Register Description” on page 110.

ATmega16 Datasheet(PDF) 89 Page - ATMEL Corporation