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ATMEGA16 датащи(PDF) 121 Page - ATMEL Corporation

номер детали ATMEGA16
подробное описание детали  8-bit AVR Microcontroller with 16K Bytes In-System Programmable Flash
PDF  315 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA16 датащи(HTML) 121 Page - ATMEL Corporation

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121
ATmega16(L)
2466E–AVR–10/02
Figure 63 shows the setting of OCF2 and the clearing of TCNT2 in CTC mode.
Figure 63. 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 – TCCR2
• Bit 7 – FOC2: Force Output Compare
The FOC2 bit is only active when the WGM bits specify a non-PWM mode. However, for
ensuring compatibility with future devices, this bit must be set to zero when TCCR2 is
written when operating in PWM mode. When writing a logical one to the FOC2 bit, an
immediate compare match is forced on the waveform generation unit. The OC2 output is
changed according to its COM21:0 bits setting. Note that the FOC2 bit is implemented
as a strobe. Therefore it is the value present in the COM21:0 bits that determines the
effect of the forced compare.
A FOC2 strobe will not generate any interrupt, nor will it clear the timer in CTC mode
using OCR2 as TOP.
The FOC2 bit is always read as zero.
• Bit 6, 3 – WGM21:0: 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
50 and “Modes of Operation” on page 115.
OCFn
OCRn
CNTn
CTC)
TOP
TOP - 1
TOP
BOTTOM
BOTTOM + 1
clk
I/O
clk
Tn
clk
I/O/8)
Bit
7
65
43
2
1
0
FOC2
WGM20
COM21
COM20
WGM21
CS22
CS21
CS20
TCCR2
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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