ATMEGA64L-8MI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA64L-8MI

8-bit AVR® Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

16-bit Timer/Counter

(Timer/Counter1 and

Timer/Counter3)

The 16-bit Timer/Counter unit allows accurate program execution timing (event man-

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

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

• Three 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

• Ten Independent Interrupt Sources (TOV1, OCF1A, OCF1B, OCF1C, ICF1, TOV3, OCF3A,

OCF3B, OCF3C, and ICF3)

Restrictions in ATmega103

Compatibility Mode

Note that in ATmega103 compatibility mode, only one 16-bit Timer/Counter is available

(Timer/Counter1). Also note that in ATmega103 compatibility mode, the Timer/Counter1

has two compare registers (Compare A and Compare B) only.

Overview

Most register and bit references in this datasheet 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). The physical I/O Register and bit locations for ATmega64 are listed in the

“16-bit Timer/Counter Register Description” on page 131.

A simplified block diagram of the 16-bit Timer/Counter is shown in Figure 46. CPU

accessible I/O Registers, including I/O bits and I/O pins, are shown in bold.

110 ATmega64(L)

2490G–AVR–03/04

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