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ATmega64A Datasheet(PDF) 157 Page - ATMEL Corporation

Part # ATmega64A
Description  8-bit Microcontroller with 64K Bytes In-System Programmable Flash
PDF  392 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega64A Datasheet(HTML) 157 Page - ATMEL Corporation

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157
8160C–AVR–07/09
ATmega64A
Figure 17-10. Timer/Counter Timing Diagram, Setting of OCF2, with Prescaler (f
clk_I/O/8)
Figure 17-11 shows the setting of OCF2 and the clearing of TCNT2 in CTC mode.
Figure 17-11. Timer/Counter Timing Diagram, Clear Timer on Compare Match Mode, with Pres-
caler (f
clk_I/O/8)
17.9
Register Description
17.9.1
TCCR2 – Timer/Counter Control Register
• Bit 7 – FOC2: Force Output Compare
The FOC2 bit is only active when the WGM20 bit specifies 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 Com-
pare 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.
OCFn
OCRn
TCNTn
OCRn Value
OCRn - 1
OCRn
OCRn + 1
OCRn + 2
clk
I/O
clk
Tn
(clk
I/O/8)
OCFn
OCRn
TCNTn
(CTC)
TOP
TOP - 1
TOP
BOTTOM
BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O/8)
Bit
7
6
5
4
3
210
0x25 (0x45)
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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