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ATTINY2313-20MU データシート(Datasheet) 79 Page - ATMEL Corporation

部品番号. ATTINY2313-20MU
部品情報  8-bit Microcontroller with 2K Bytes In-System Programmable Flash
ダウンロード  231 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
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 79 page
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79
ATtiny2313/V
2543I–AVR–04/06
Table 39 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 73 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 40. 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 70).
Notes:
1. MAX
= 0xFF
2. BOTTOM = 0x00
Table 39. Compare Output Mode, Phase Correct PWM Mode
(1)
COM0B1
COM0B0
Description
0
0
Normal port operation, OCR0B disconnected.
01
Reserved
1
0
Clear ORC0B on Compare Match when up-counting. Set OCR0B
on Compare Match when down-counting.
1
1
Set OCR0B on Compare Match when up-counting. Clear OCR0B
on Compare Match when down-counting.
Table 40. Waveform Generation Mode Bit Description
Mode
WGM2
WGM1
WGM0
Timer/Count
er 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
OCR0A
Immediate
MAX
3
0
1
1
Fast PWM
0xFF
TOP
MAX
41
0
0
Reserved
5
1
0
1
PWM, Phase
Correct
OCR0A
TOP
BOTTOM
61
1
0
Reserved
7
1
1
1
Fast PWM
OCR0A
TOP
TOP




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