ATMEGA325P_06 datasheet(92/336 Pages) ATMEL

Nome de Peças	ATMEGA325P

Descrição Electrónicos	8-bit Microcontroller with 32K Bytes In-System Programmable Flash

PDF	336 Pages

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Fabricante Electrônico	ATMEL [ATMEL Corporation]

Página de início	http://www.atmel.com

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92 / 336 page

92

8023A–AVR–12/06

ATmega325P/3250P

clk

Tn

Timer/Counter clock, referred to as clk

T0 in the following.

top

Signalize that TCNT0 has reached maximum value.

bottom

Signalize that TCNT0 has reached minimum value (zero).

Depending of the mode of operation used, the counter is cleared, incremented, or decremented

at each timer clock (clk

T0). clkT0 can be generated from an external or internal clock source,

selected by the Clock Select bits (CS02:0). When no clock source is selected (CS02:0 = 0) the

timer is stopped. However, the TCNT0 value can be accessed by the CPU, regardless of

whether clk

T0 is present or not. A CPU write overrides (has priority over) all counter clear or

count operations.

The counting sequence is determined by the setting of the WGM01 and WGM00 bits located in

the Timer/Counter Control Register (TCCR0A). There are close connections between how the

counter behaves (counts) and how waveforms are generated on the Output Compare output

OC0A. For more details about advanced counting sequences and waveform generation, see

”Modes of Operation” on page 95.

The Timer/Counter Overflow Flag (TOV0) is set according to the mode of operation selected by

the WGM01:0 bits. TOV0 can be used for generating a CPU interrupt.

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