Rainbow-electronics ATmega32L Manual do Utilizador descarregar pdf (Página 104)

100

101

104

ATmega32(L)

2503C–AVR–10/02

Figure 51 shows the count sequence close to TOP in various modes. When using phase

and frequency correct PWM mode the OCR1x 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 TOV1 flag at

BOTTOM.

Figure 51. Timer/Counter Timing Diagram, no Prescaling

Figure 52 shows the same timing data, but with the prescaler enabled.

Figure 52. Timer/Counter Timing Diagram, with Prescaler (f

clk_I/O

/8)

TOVn (FPWM)

and ICFn (if used

as TOP)

OCRnx

(Update at TOP)

TCNTn

(CTC and FPWM)

TCNTn

(PC and PFC PWM)

TOP - 1 TOP TOP - 1 TOP - 2

Old OCRnx Value New OCRnx Value

TOP - 1 TOP BOTTOM BOTTOM + 1

clk

(clk

I/O

/1)

clk

I/O

TOVn (FPWM)

and ICFn (if used

as TOP)

OCRnx

(Update at TOP)

TCNTn

(CTC and FPWM)

TCNTn

(PC and PFC PWM)

TOP - 1 TOP TOP - 1 TOP - 2

Old OCRnx Value New OCRnx Value

TOP - 1 TOP BOTTOM BOTTOM + 1

clk

I/O

clk

(clk

I/O

/8)

1 2 ... 99 100 101 102 103 104 105 106 107 108 109 ... 312 313

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