Rainbow-electronics ATtiny2313 Manuel d'utilisateur télécharger pdf (Page 77)

ATtiny2313

2543A–AVR–08/03

Table 40 shows the COM0B1:0 bit functionality when the WGM02:0 bits are set to

phase correct PWM mode.

Note: 1. A special case occurs when OCR0B equals TOP and COM0B1 is set. In this case,

the Compare Match is ignored, but the set or clear is done at TOP. See “Phase Cor-

rect PWM Mode” on page 72 for more details.

• Bits 3, 2 – Res: Reserved Bits

These bits are reserved bits in the ATtiny2313 and will always read as zero.

• Bits 1:0 – WGM01:0: Waveform Generation Mode

Combined with the WGM02 bit found in the TCCR0B 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 41. Modes of operation sup-

ported by the Timer/Counter unit are: Normal mode (counter), Clear Timer on Compare

Match (CTC) mode, and two types of Pulse Width Modulation (PWM) modes (see

“Modes of Operation” on page 95).

Notes: 1. MAX = 0xFF

2. BOTTOM = 0x00

Table 40. Compare Output Mode, Phase Correct PWM Mode

(1)

COM0B1 COM0B0 Description

0 0 Normal port operation, OC0B disconnected.

01Reserved

1 0 Clear OC0B on Compare Match when up-counting. Set OC0B on

Compare Match when down-counting.

1 1 Set OC0B on Compare Match when up-counting. Clear OC0B on

Compare Match when down-counting.

Table 41. Waveform Generation Mode Bit Description

Mode WGM2 WGM1 WGM0

Timer/Counter

Mode of

Operation TOP

Update of

OCRx at

TOV Flag

Set on

(1)(2)

0 0 0 0 Normal 0xFF Immediate MAX

1 0 0 1 PWM, Phase

Correct

0xFF TOP BOTTOM

2 0 1 0 CTC OCRA Immediate MAX

3 0 1 1 Fast PWM 0xFF TOP MAX

4 1 0 0 Reserved – – –

5 1 0 1 PWM, Phase

Correct

OCRA TOP BOTTOM

6 1 1 0 Reserved – – –

7 1 1 1 Fast PWM OCRA TOP TOP

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 210 211

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