ATtiny261A datasheet(87/292 Pages) ATMEL

87 / 292 page

8197A–AVR–10/09

ATtiny261A/461A/861A

12. Timer/Counter1

12.1 Features

• 8/10-Bit Accuracy

• Three Independent Output Compare Units

• Clear Timer on Compare Match (Auto Reload)

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

• Variable PWM Period

• High Speed Asynchronous and Synchronous Clocking with Dedicated Prescaler

• Independent Dead Time Generators for Each PWM Channel

• Fault Protection Unit Can Disable PWM Output Pins

• Five Independent Interrupt Sources (TOV1, OCF1A, OCD1B, OCF1D, FPF1)

12.2 Overview

Timer/Counter1 is a general purpose high speed Timer/Counter module, with three independent

Output Compare Units, and with PWM support.

The Timer/Counter1 features a high resolution and a high accuracy usage with the lower pres-

caling opportunities. It can also support three accurate and high speed Pulse Width Modulators

using clock speeds up to 64 MHz. In PWM mode Timer/Counter1 and the output compare regis-

ters serve as triple stand-alone PWMs with non-overlapping non-inverted and inverted outputs.

Similarly, the high prescaling opportunities make this unit useful for lower speed functions or

exact timing functions with infrequent actions. A simplified block diagram of the Timer/Counter1

is shown in Figure 12-1.

Figure 12-1. Timer/Counter1 Block Diagram

8-BIT DATABUS

T/C INT. FLAG

10-BIT COMPARATOR

8-BIT OUTPUT COMPARE

T/C INT. MASK

TIMER/COUNTER1

(TCNT1)

DIRECTION

TIMER/COUNTER1 CONTROL LOGIC

TOV1

OCF1B

OC1A

OCF1A

T/C CONTROL

10-BIT COMPARATOR

8-BIT OUTPUT COMPARE

T/C CONTROL

OC1A

OC1B

DEAD TIME GENERATOR

10-BIT COMPARATOR

8-BIT OUTPUT COMPARE

10-BIT COMPARATOR

8-BIT OUTPUT COMPARE

T/C CONTROL

OCF1D

OC1D

DEAD TIME GENERATOR

OCW1A

OCW1B

OCW1D

2-BIT HIGH BYTE

T/C CONTROL

10-BIT OUTPUT

COMPARE REGISTER B

10-BIT OUTPUT

COMPARE REGISTER C

10-BIT OUTPUT

COMPARE REGISTER D

10-BIT OUTPUT

COMPARE REGISTER A

CLEAR

COUNT

CLK

T/C CONTROL

FAULT_PROTECTION

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