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ATmega165-16AI 데이터시트(PDF) 85 Page - ATMEL Corporation

부품명 ATmega165-16AI
상세설명  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
PDF  336 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega165-16AI 데이터시트(HTML) 85 Page - ATMEL Corporation

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ATmega165/V
2573G–AVR–07/09
Figure 37 shows the setting of OCF0A and the clearing of TCNT0 in CTC mode.
Figure 37. Timer/Counter Timing Diagram, Clear Timer on Compare Match mode, with
Prescaler (f
clk_I/O/8)
8-bit Timer/Counter
Register Description
Timer/Counter Control
Register A – TCCR0A
• Bit 7 – FOC0A: Force Output Compare A
The FOC0A bit is only active when the WGM00 bit specifies a non-PWM mode. How-
ever, for ensuring compatibility with future devices, this bit must be set to zero when
TCCR0 is written when operating in PWM mode. When writing a logical one to the
FOC0A bit, an immediate compare match is forced on the Waveform Generation unit.
The OC0A output is changed according to its COM0A1:0 bits setting. Note that the
FOC0A bit is implemented as a strobe. Therefore it is the value present in the
COM0A1:0 bits that determines the effect of the forced compare.
A FOC0A strobe will not generate any interrupt, nor will it clear the timer in CTC mode
using OCR0A as TOP.
The FOC0A bit is always read as zero.
• Bit 6, 3 – WGM01:0: Waveform Generation Mode
These bits control the counting sequence of the counter, the source for the maximum
(TOP) counter value, and what type of waveform generation to be used. Modes of oper-
ation supported by the Timer/Counter unit are: Normal mode, Clear Timer on Compare
match (CTC) mode, and two types of Pulse Width Modulation (PWM) modes. See Table
42 and “Modes of Operation” on page 80.
OCFnx
OCRnx
TCNTn
(CTC)
TOP
TOP - 1
TOP
BOTTOM
BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O/8)
Bit
7
6
5
4
3
2
1
0
FOC0A
WGM00
COM0A1
COM0A0
WGM01
CS02
CS01
CS00
TCCR0
Read/Write
W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0



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