Rainbow-electronics Atmega169L Manuel d'utilisateur télécharger pdf (Page 118)

118

ATmega169V/L

2514A–AVR–08/02

Note: 1. The CTC1 and PWM11:0 bit definition names are obsolete. Use the WGM12:0 definitions. However, the functionality and

location of these bits are compatible with previous versions of the timer.

Timer/Counter1 Control

• Bit 7 – ICNC1: Input Capture Noise Canceler

Setting this bit (to one) activates the Input Capture Noise Canceler. When the noise can-

celer is activated, the input from the Input Capture pin (ICP1) is filtered. The filter

function requires four successive equal valued samples of the ICP1 pin for changing its

output. The Input Capture is therefore delayed by four Oscillator cycles when the noise

canceler is enabled.

• Bit 6 – ICES1: Input Capture Edge Select

This bit selects which edge on the Input Capture pin (ICP1) that is used to trigger a cap-

ture event. When the ICES1 bit is written to zero, a falling (negative) edge is used as

trigger, and when the ICES1 bit is written to one, a rising (positive) edge will trigger the

capture.

When a capture is triggered according to the ICES1 setting, the counter value is copied

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

Table 58. 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

0 0 0 0 0 Normal 0xFFFF Immediate MAX

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

2 0 0 1 0 PWM, Phase Correct, 9-bit 0x01FF TOP BOTTOM

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

4 0 1 0 0 CTC OCR1A Immediate MAX

5 0 1 0 1 Fast PWM, 8-bit 0x00FF TOP TOP

6 0 1 1 0 Fast PWM, 9-bit 0x01FF TOP TOP

7 0 1 1 1 Fast PWM, 10-bit 0x03FF TOP TOP

8 1 0 0 0 PWM, Phase and Frequency

Correct

ICR1 BOTTOM BOTTOM

9 1 0 0 1 PWM, Phase and Frequency

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 CTC ICR1 Immediate MAX

13 1 1 0 1 (Reserved) –– –

14 1 1 1 0 Fast PWM ICR1 TOP TOP

151111FastPWM OCR1ATOPTOP

Bit 7654 3 210

ICNC1 ICES1 – WGM13 WGM12 CS12 CS11 CS10 TCCR1B

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

InitialValue0000 0000

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 316 317

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Rainbow-electronics Atmega169L Manuel d'utilisateur Page 118

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