Rainbow-electronics ATmega128L Uživatelský manuál stáhnout pdf (Strana 129)

129

ATmega128(L)

2467B–09/01

Note: A special case occurs when OCRnA/OCRnB/OCRnC equals TOP and

COMnA1/COMnB1//COMnC1 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 waveform generation to be used, see

Table 61. 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 117.

)

Table 60. Compare Output Mode, Phase Correct and Phase and Frequency Correct

PWM

COMnA1/COMnB /

COMnC1

COMnA0/COMnB0/

COMnC0 Description

0 0 Normal port operation, OCnA/OCnB/OCnC

disconnected.

0 1 WGMn3=0: Normal port operation,

OCnA/OCnB/OCnC disconnected.

WGMn3=1: Toggle OCnA on compare

match, OCnB/OCnC reserved.

1 0 Clear OCnA/OCnB/OCnC on compare

match when up-counting. Set

OCnA/OCnB/OCnC on compare match

when downcounting.

1 1 Set OCnA/OCnB/OCnC on compare match

when up-counting. Clear

OCnA/OCnB/OCnC on compare match

when downcounting.

1 2 ... 124 125 126 127 128 129 130 131 132 133 134 ... 330 331

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Rainbow-electronics ATmega128L Uživatelský manuál Strana 129