Rainbow-electronics ATmega8515L Manuel d'utilisateur télécharger pdf (Page 94)

ATmega8515(L)

2512A–AVR–04/02

16-bit

Timer/Counter1

The16-bit Timer/Counter unit allows accurate program execution timing (event man-

agement), wave generation, andsignal timing measurement. Themainfeatures 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

• 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)

Overview Most register andbit references in thisdocument are writteningeneralform. A lower

case“n”replaces theTimer/Counter number, and a lowercase“x” replaces theoutput

compare unit channel. However, when using the register orbit defines in a program, the

precise formmust beused, i.e., TCNT1 for accessing Timer/Counter1 counter value

andsoon.The physicalI/Oregister andbit locationsfor ATmega8515 are listed in the

“16-bit Timer/Counter RegisterDescription” on page 116.

A simplifiedblock diagram of the16-bit Timer/Counter isshowninFigure46. CPU

accessible I/Oregisters, including I/Obits andI/Opins, are showninbold.

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 222 223

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Rainbow-electronics ATmega8515L Manuel d'utilisateur Page 94