Rainbow-electronics ATmega32L Manuale Utente Scaricare il pdf (Pagina 76)

100

101

ATmega32(L)

2503C–AVR–10/02

Timer/Counter Timing

Diagrams

The Timer/Counter is a synchronous design and the timer clock (clk

) is therefore

shown as a clock enable signal in the following figures. The figures include information

on when interrupt flags are set. Figure 34 contains timing data for basic Timer/Counter

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

other than phase correct PWM mode.

Figure 34. Timer/Counter Timing Diagram, no Prescaling

Figure 35 shows the same timing data, but with the prescaler enabled.

Figure 35. Timer/Counter Timing Diagram, with Prescaler (f

clk_I/O

/8)

Figure 36 shows the setting of OCF0 in all modes except CTC mode.

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 ... 71 72 73 74 75 76 77 78 79 80 81 ... 312 313

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