Rainbow-electronics ATmega32L Uživatelský manuál stáhnout pdf (Strana 107)

107

ATmega32(L)

2503C–AVR–10/02

A FOC1A/FOC1B strobe will not generate any interrupt nor will it clear the timer in Clear

Timer on Compare match (CTC) mode using OCR1A as TOP.

The FOC1A/FOC1B bits are always read as zero.

• 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 47. 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 95.)

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.

Table 47. Waveform Generation Mode Bit Description

(1)

Mode WGM13

WGM12

(CTC1)

WGM11

(PWM11)

WGM10

(PWM10)

Timer/Counter Mode of

Operation TOP

Update of

OCR1x

TOV1 Flag

Set on

00 0 0 0

Normal 0xFFFF Immediate MAX

10 0 0 1

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

20 0 1 0

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

30 0 1 1

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

40 1 0 0

CTC OCR1A Immediate MAX

50 1 0 1

Fast PWM, 8-bit 0x00FF TOP TOP

60 1 1 0

Fast PWM, 9-bit 0x01FF TOP TOP

70 1 1 1

Fast PWM, 10-bit 0x03FF TOP TOP

81 0 0 0

PWM, Phase and Frequency Correct ICR1 BOTTOM BOTTOM

91 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

15 1 1 1 1

Fast PWM OCR1A TOP TOP

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 312 313

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