Rainbow-electronics ATmega64C1 Manuel d'utilisateur télécharger pdf (Page 106)

106

7647A–AVR–02/08

ATmega32/64/M1/C1

13. 16-bit Timer/Counter1 with PWM

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

• Retriggering Function by External Signal (ICP1A or ICP1B)

• 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)

13.1 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

channel. 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 13-1. For the actual

placement of I/O pins, refer to “Pin Descriptions” on page 5. 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 “16-bit Timer/Counter Register Description” on page 126.

The PRTIM1 bit in “Power Reduction Register” on page 41 must be written to zero to enable

Timer/Counter1 module.

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Rainbow-electronics ATmega64C1 Manuel d'utilisateur Page 106