ATmega16HVB datasheet(82/273 Pages) ATMEL

82 / 273 page

8042A–AVR–07/09

ATmega16HVB/32HVB

17. Timer/Counter (T/C0,T/C1)

17.1

Features

• Clear Timer on Compare Match (Auto Reload)

• Input Capture unit

• Four Independent Interrupt Sources (TOVn, OCFnA, OCFnB, ICFn)

• 8-bit Mode with Two Independent Output Compare Units

• 16-bit Mode with One Independent Output Compare Unit

17.2

Overview

Timer/Counter n is a general purpose 8-/16-bit Timer/Counter module, with two/one Output

Compare units and Input Capture feature.

ATmega16HVB/32HVB has two Timer/Counters, Timer/Counter0 and Timer/Counter1. The

functionality for both Timer/Counters is described below. Timer/Counter0 and Timer/Counter1

have different Timer/Counter registers, as shown in ”Register Summary” on page 254.

The Timer/Counter general operation is described in 8-/16-bit mode. A simplified block diagram

of the 8-/16-bit Timer/Counter is shown in Figure 17-1. 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 ”Register Description” on page 94.

Figure 17-1. 8-/16-bit Timer/Counter Block Diagram

17.2.1

Registers

The Timer/Counter Low Byte Register (TCNTnL) and Output Compare Registers (OCRnA and

OCRnB) are 8-bit registers. Interrupt request (abbreviated to Int.Req. in Figure 17-1 on page 82)

signals are all visible in the Timer Interrupt Flag Register (TIFR). All interrupts are individually

masked with the Timer Interrupt Mask Register (TIMSK). TIFR and TIMSK are not shown in the

figure.

In 16-bit mode the Timer/Counter consists one more 8-bit register, the Timer/Counter High Byte

two Output Compare Registers, OCRnA and OCRnB, are combined to one 16-bit Output Com-

pare Register. OCRnA contains the low byte of the word and OCRnB contains the higher byte of

Clock Select

Timer/Counter

OCRnB

TCNTnL

Noise

Canceler

ICPn0

Edge

Detector

Control Logic

TOP

Count

Clear

Direction

TOVn (Int. Req.)

OCnA (Int. Req.)

OCnB (Int. Req.)

ICFn (Int. Req.)

TCCRnA

TCCRnB

Edge

Detector

( From Prescaler )

clk

OCRnA

TCNTnH

Fixed TOP value

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