Rainbow-electronics ATmega8515L Manual do Utilizador descarregar pdf (Página 118)

118

ATmega8515(L)

2512A–AVR–04/02

Note: 1. The CTC1and PWM11:0 bit definition names areobsolete. Usethe WGM12:0 definitions. However, the functionality and

location of these bits are compatible withprevious versions of thetimer.

Timer/Counter1 Control

• Bit 7 – ICNC1: Input Capture Noise Canceler

Setting thisbit (to one) activates the Input Capture Noise Canceler. When the Noise

Canceler is activated, theinput from the Input CapturePin(ICP1) isfiltered.The filter

function requiresfoursuccessive equal valuedsamples of the ICP1 pin forchanging its

output. Theinput captureis therefore delayedbyfourOscillator cycleswhen the noise

canceler is enabled.

• Bit6–ICES1:InputCaptureEdgeSelect

Thisbit selectswhich edge on the Input CapturePin(ICP1) that is used to trigger a cap-

tureevent.When the ICES1 bit iswritten to zero, a falling (negative) edge is used as

trigger, andwhen the ICES1 bit iswritten to one, a rising (positive) edge will trigger the

capture.

When a captureis triggered accordingtothe ICES1 setting, the counter value iscopied

into the Input CaptureRegister(ICR1).The event will also set the Input Capture Flag

(ICF1), and thiscan beused to causeanInput Capture Interrupt, if this interruptis

enabled.

Table 53. Waveform Generation Mode Bit Description

(1)

Mode WGM13

WGM12

(CTC1)

WGM11

(PWM11)

WGM10

(PWM10) Timer/Counter Mode of Operation TOP

Update of

OCR1x at

TOV1 Flag

Set on

00 0 0 0Normal 0xFFFF Immediate MAX

10 0 0 1PWM, Phase Correct, 8-bit 0x00FF TOP BOTTOM

20 0 1 0PWM, Phase Correct,9-bit 0x01FF TOP BOTTOM

3 00 1 1PWM, Phase Correct, 10-bit 0x03FF TOP BOTTOM

40 1 0 0CTCOCR1A Immediate MAX

50 1 0 1FastPWM, 8-bit 0x00FF TOPTOP

6 01 1 0FastPWM, 9-bit 0x01FF TOPTOP

7 01 1 1FastPWM, 10-bit 0x03FF TOPTOP

81 0 0 0PWM, PhaseandFrequency Correct ICR1 BOTTOM BOTTOM

9 10 0 1PWM, PhaseandFrequency Correct OCR1A BOTTOM BOTTOM

10 1 0 1 0 PWM, Phase Correct ICR1 TOP BOTTOM

11 1 0 1 1 PWM, Phase Correct OCR1A TOP BOTTOM

12 1 1 0 0 CTCICR1 Immediate MAX

13 11 0 1Reserved –– –

14 1 1 1 0 FastPWM ICR1 TOPTOP

15 1 1 1 1 FastPWM OCR1A TOPTOP

Bit 76543 210

ICNC1 ICES1 – WGM13 WGM12 CS12 CS11 CS10 TCCR1B

Read/Write R/W R/W RR/W R/W R/W R/W R/W

Initial Value00000000

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 222 223

Comentários a estes Manuais

Sem comentários

Rainbow-electronics ATmega8515L Manual do Utilizador Página 118

Comentários a estes Manuais

Manuais e produtos relacionados com Sensores Rainbow-electronics ATmega8515L