Rainbow-electronics ATmega8515L Manual do Utilizador descarregar pdf (Página 89)

ATmega8515(L)

2512A–AVR–04/02

Note: 1. A specialcaseoccurs when OCR0 equals TOPandCOM01 isset. Inthiscase, the

comparematch is ignored, but the set orclear isdone at TOP. See “FastPWM Mode”

on page 83for more details.

Table47shows the COM01:0 bit functionalitywhen the WGM01:0 bits are set to phase

correctPWM mode.

Note: 1. A specialcaseoccurs when OCR0 equals TOPandCOM01 isset. Inthiscase, the

comparematch is ignored, but the set orclear isdone at TOP. See “Phase Correct

PWM Mode” on page 85 for more details.

• Bit 2:0 – CS02:0: Clock Select

Thethree Clock Select bitsselectthe clock sourcetobeusedbytheTimer/Counter.

If externalpin modes areusedfor theTimer/Counter0, transitions on theT0pin will

clock the counter even if the pin isconfigured as an output. Thisfeatureallows software

control of the counting.

Table 46. Compare Output Mode,FastPWM Mode

(1)

COM01 COM00 Description

00Normalportoperation,OC0 disconnected.

01Reserved

10ClearOC0oncomparematch, set OC0atTOP.

11Set OC0oncomparematch, clearOC0atTOP.

Table 47. Compare Output Mode, Phase CorrectPWM Mode

(1)

COM01 COM00 Description

00Normalportoperation,OC0 disconnected.

01Reserved

10ClearOC0oncomparematch when up-counting. Set OC0on

comparematch when downcounting.

11Set OC0oncomparematch when up-counting. ClearOC0on

comparematch when downcounting.

Table 48. Clock Select Bit Description

CS02 CS01 CS00 Description

000No clock source (Timer/counterstopped).

001

clk

I/O

/(No prescaling)

010

clk

I/O

/8 (From prescaler)

011

clk

I/O

/64 (From prescaler)

100

clk

I/O

/256(From prescaler)

101

clk

I/O

/1024 (From prescaler)

110Externalclock sourceonT0pin. Clock on falling edge.

111Externalclock sourceonT0pin. Clock on rising edge.

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 222 223

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