Rainbow-electronics ATmega162V Manual do Utilizador descarregar pdf (Página 125)

125

ATmega162/V

2513E–AVR–09/03

Timer/Counter Timing

Diagrams

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

n) is therefore

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

on when Interrupt Flags are set, and when the OCRnx Register is updated with the

OCRnx buffer value (only for modes utilizing double buffering). Figure 55 shows a timing

diagram for the setting of OCFnx.

Figure 55. Timer/Counter Timing Diagram, Setting of OCFnx, no Prescaling

Figure 56 shows the same timing data, but with the prescaler enabled.

Figure 56. Timer/Counter Timing Diagram, Setting of OCFnx, with Prescaler (f

clk_I/O

/8)

Figure 57 shows the count sequence close to TOP in various modes. When using phase

and frequency correct PWM mode the OCRnx Register is updated at BOTTOM. The

timing diagrams will be the same, but TOP should be replaced by BOTTOM, TOP-1 by

BOTTOM+1 and so on. The same renaming applies for modes that set the TOVn Flag

at BOTTOM.

clk

(clk

I/O

/1)

OCFnx

clk

I/O

OCRnx

TCNTn

OCRnx Value

OCRnx - 1 OCRnx OCRnx + 1 OCRnx + 2

OCFnx

OCRnx

TCNTn

OCRnx Value

OCRnx - 1 OCRnx OCRnx + 1 OCRnx + 2

clk

I/O

clk

(clk

I/O

/8)

1 2 ... 120 121 122 123 124 125 126 127 128 129 130 ... 322 323

Comentários a estes Manuais

Sem comentários

Rainbow-electronics ATmega162V Manual do Utilizador Página 125

Comentários a estes Manuais

Manuais e produtos relacionados com Sensores Rainbow-electronics ATmega162V