Rainbow-electronics ATmega64M1 Instrukcja Użytkownika Pobierz pdf (Strona 86)

8209A–AVR–08/09

ATmega16M1/32M1/64M1

15. 8-bit Timer/Counter0 with PWM

15.1 Features

• Two Independent Output Compare Units

• Double Buffered Output Compare Registers

• Clear Timer on Compare Match (Auto Reload)

• Glitch Free, Phase Correct Pulse Width Modulator (PWM)

• Variable PWM Period

• Frequency Generator

• Three Independent Interrupt Sources (TOV0, OCF0A, and OCF0B)

15.2 Overview

Timer/Counter0 is a general purpose 8-bit Timer/Counter module, with two independent Output

Compare Units, and with PWM support. It allows accurate program execution timing (event man-

agement) and wave generation.

A simplified block diagram of the 8-bit Timer/Counter is shown in Figure 15-1. For the actual

placement of I/O pins, refer to “Pin Descriptions” on page 7. 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 loca-

tions are listed in the “Register Description” on page 97.

The PRTIM0 bit in “Power Reduction Register” on page 39 must be written to zero to enable

Timer/Counter0 module.

Figure 15-1. 8-bit Timer/Counter Block Diagram

Timer/Counter

DATA B US

TCNTn

Waveform

Generation

OCnA

Control Logic

count

clear

direction

TOVn

(Int.Req.)

OCRnx

TCCRnA

Clock Select

Edge

Detector

( From Prescaler )

clk

OCnA

(Int.Req.)

OCRnx

Waveform

Generation

OCnB

(Int.Req.)

TCCRnB

Fixed

TOP

Values

= 0

TOP BOTTOM

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 342 343

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