Rainbow-electronics ATmega8515L Manual do Utilizador descarregar pdf (Página 86)

ATmega8515(L)

2512A–AVR–04/02

OCR0 and TCNT0 when the counterdecrements.ThePWM frequency for theoutput

when using phase correctPWM can be calculatedbythe following equation:

The N variable represents the prescale factor(1, 8,64, 256, or 1024).

Theextreme valuesfor the OCR0 Registerrepresent specialcaseswhen generating a

PWM waveform output in the phase correctPWM mode. If the OCR0 isset equal to

BOTTOM, the output will be continuously low and ifset equal to MAX the output will be

continuously highfor non-inverted PWM mode. For inverted PWM theoutput will have

theopposite logic values.

Timer/Counter Timing

Diagrams

TheTimer/Counter is a synchronousdesign and thetimerclock (clk

) is therefore

shownas a clock enable signal in the following figures.The figures includeinformation

on when interrupt flags are set. Figure40contains timing data forbasic Timer/Counter

operation. The figure shows the count sequence closetothe MAX value in all modes

other than phase correctPWM mode.

Figure 40. Timer/Counter Timing Diagram, no Prescaling

Figure41shows the same timing data,but with the prescaler enabled.

Figure 41. Timer/Counter Timing Diagram,with Prescaler(f

clk_I/O

/8)

Figure42shows the setting ofOCF0inall modes except CTC mode.

OCnPCPWM

clk_I/O

N 510⋅

------------------=

clk

(clk

I/O

/1)

TOVn

clk

I/O

TCNTn MAX - 1 MAX BOTTOM BOTTOM + 1

TOVn

TCNTn

MAX - 1 MAX BOTTOM BOTTOM + 1

clk

I/O

clk

(clk

I/O

/8)

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 222 223

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