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ATMEGA640 데이터시트(PDF) 128 Page - Microchip Technology

부품명 ATMEGA640
상세설명  8-bit Microcontroller with 16/32/64KB In-System Programmable Flash
PDF  436 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATMEGA640 데이터시트(HTML) 128 Page - Microchip Technology

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]
DS40002211A
Table 16-7 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 Correct PWM Mode” on page 122 for more details.
• Bits 3, 2 – Res: Reserved Bits
These bits are reserved bits 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 16-8. Modes of operation supported 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 144).
Note:
1. MAX
= 0xFF
2. BOTTOM = 0x00
Table 16-7.
Compare Output Mode, Phase Correct PWM Mode(1)
COM0B1
COM0B0
Description
0
0
Normal port operation, OC0B disconnected
01
Reserved
10
Clear OC0B on Compare Match when up-counting. Set OC0B on Compare Match when
down-counting
11
Set OC0B on Compare Match when up-counting. Clear OC0B on Compare Match when
down-counting
Table 16-8.
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
20
10
CTC
OCRA
Immediate
MAX
3
0
1
1
Fast PWM
0xFF
TOP
MAX
41
00
Reserved
–
–
–
5
1
0
1
PWM, Phase Correct
OCRA
TOP
BOTTOM
61
10
Reserved
–
–
–
7
1
1
1
Fast PWM
OCRA
BOTTOM
TOP



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