Rainbow-electronics ATmega8HVD Manuel d'utilisateur télécharger pdf (Page 74)

8052B–AVR–09/08

ATmega4HVD/8HVD

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

16.1 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

16.2 Overview

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

Compare units and Input Capture feature.

ATmega4HVD/8HVD 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 151.

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

gram of the 8-/16-bit Timer/Counter is shown in Figure 16-1. 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 86.

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

Clock Select

Timer/Counter

DATA B U S

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

ICPn1

1 2 ... 69 70 71 72 73 74 75 76 77 78 79 ... 167 168

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