Rainbow-electronics ATmega64C1 Manual de usuario descargar pdf (Pagina 128)

128

7647A–AVR–02/08

ATmega32/64/M1/C1

Note: 1. A special case occurs when OCRnA/OCRnB equals TOP and COMnA1/COMnB1 is set. See

“Phase Correct PWM Mode” on page 121. for more details.

• Bit 1:0 – WGMn1:0: Waveform Generation Mode

Combined with the WGMn3:2 bits found in the TCCRnB Register, these bits control the counting

sequence of the counter, the source for maximum (TOP) counter value, and what type of wave-

form generation to be used, see Table 13-4. Modes of operation supported by the Timer/Counter

unit are: Normal mode (counter), Clear Timer on Compare match (CTC) mode, and three types

of Pulse Width Modulation (PWM) modes. (See “16-bit Timer/Counter1 with PWM” on page

106.).

WGMn3:0 = 8, 9 10 or 11: Toggle OCnA on Compare

Match, OCnB disconnected (normal port operation).

For all other WGM1 settings, normal port operation,

OC1A/OC1B disconnected.

Clear OCnA/OCnB on Compare Match when up-

counting. Set OCnA/OCnB on Compare Match when

downcounting.

Set OCnA/OCnB on Compare Match when up-

counting. Clear OCnA/OCnB on Compare Match

when downcounting.

Table 13-3. Compare Output Mode, Phase Correct and Phase and Frequency Correct

PWM

(1)

COMnA1/COMnB1 COMnA0/COMnB0 Description

Table 13-4. Waveform Generation Mode Bit Description

(1)

Mode WGMn3

WGMn2

(CTCn)

WGMn1

(PWMn1)

WGMn0

(PWMn0)

Timer/Counter Mode of

Operation TOP

Update of

OCRnx at

TOVn 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 OCRnA 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

81000

PWM, Phase and Frequency

Correct

ICRn BOTTOM BOTTOM

91001

PWM, Phase and Frequency

Correct

OCRnA BOTTOM BOTTOM

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

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

12 1 1 0 0 CTC ICRn Immediate MAX

13 1 1 0 1 (Reserved) – – –

14 1 1 1 0 Fast PWM ICRn TOP TOP

15 1 1 1 1 Fast PWM OCRnA TOP TOP

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 365 366

Rainbow-electronics ATmega64C1 Manual de usuario Pagina 128

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