Rainbow-electronics Atmega169L Manuel d'utilisateur télécharger pdf (Page 117)

117

ATmega169V/L

2514A–AVR–08/02

Table 57 shows the COM1x1:0 bit functionality when the WGM13:0 bits are set to the

phase correct or the phase and frequency correct, PWM mode.

Note: 1. A special case occurs when OCR1A/OCR1B equals TOP and COM1A1/COM1B1 is

set. See “Phase Correct PWM Mode” on page 110. for more details.

• Bit 1:0 – WGM11:0: Waveform Generation Mode

Combined with the WGM13:2 bits found in the TCCR1B Register, these bits control the

counting sequence of the counter, the source for maximum (TOP) counter value, and

what type of waveform generation to be used, see Table 58. Modes of operation sup-

ported 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

“Modes of Operation” on page 106.).

Table 57. Compare Output Mode, Phase Correct and Phase and Frequency Correct

PWM

(1)

COM1A1/COM1B1 COM1A0/COM1B0 Description

0 0 Normal port operation, OC1A/OC1B

disconnected.

0 1 WGM13=0: Normal port operation, OC1A/OC1B

disconnected.

WGM13=1: Toggle OC1A on Compare Match,

OC1B reserved.

1 0 Clear OC1A/OC1B on Compare Match when up-

counting. Set OC1A/OC1B on Compare Match

when downcounting.

1 1 Set OC1A/OC1B on Compare Match when up-

counting. Clear OC1A/OC1B on Compare Match

when downcounting.

1 2 ... 112 113 114 115 116 117 118 119 120 121 122 ... 316 317

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Rainbow-electronics Atmega169L Manuel d'utilisateur Page 117