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ATMEGA640 Datasheet(PDF) 164 Page - ATMEL Corporation

Part # ATMEGA640
Description  8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
PDF  449 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA640 Datasheet(HTML) 164 Page - ATMEL Corporation

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ATmega640/1280/1281/2560/2561
2549K–AVR–01/07
TCCR1C – Timer/Counter 1
Control Register C
TCCR3C – Timer/Counter 3
Control Register C
TCCR4C – Timer/Counter 4
Control Register C
TCCR5C – Timer/Counter 5
Control Register C
• Bit 7 – FOCnA: Force Output Compare for Channel A
• Bit 6 – FOCnB: Force Output Compare for Channel B
• Bit 5 – FOCnC: Force Output Compare for Channel C
The FOCnA/FOCnB/FOCnC bits are only active when the WGMn3:0 bits specifies a
non-PWM mode. When writing a logical one to the FOCnA/FOCnB/FOCnC bit, an
immediate compare match is forced on the waveform generation unit. The
OCnA/OCnB/OCnC output is changed according to its COMnx1:0 bits setting. Note that
the FOCnA/FOCnB/FOCnC bits are implemented as strobes. Therefore it is the value
present in the COMnx1:0 bits that determine the effect of the forced compare.
A FOCnA/FOCnB/FOCnC strobe will not generate any interrupt nor will it clear the timer
in Clear Timer on Compare Match (CTC) mode using OCRnA as TOP.
The FOCnA/FOCnB/FOCnB bits are always read as zero.
• Bit 4:0 – Reserved Bits
These bits are reserved for future use. For ensuring compatibility with future devices,
these bits must be written to zero when TCCRnC is written.
Bit
765
4
3
210
(0x82)
FOC1A
FOC1B
FOC1C
–
–
–
–
–
TCCR1C
Read/Write
WW
W
RR
R
R
R
Initial Value
0
0
0
0
0
0
0
0
Bit
765
4
3
210
(0x92)
FOC3A
FOC3B
FOC3C
–
–
–
–
–
TCCR3C
Read/Write
WW
W
RR
R
R
R
Initial Value
0
0
0
0
0
0
0
0
Bit
765
4
3
210
(0xA2)
FOC4A
FOC4B
FOC4C
–
–
–
–
–
TCCR4C
Read/Write
WW
W
RR
R
R
R
Initial Value
0
0
0
0
0
0
0
0
Bit
765
4
3
210
(0x122)
FOC5A
FOC5B
FOC3C
–
–
–
–
–
TCCR5C
Read/Write
WW
W
RR
R
R
R
Initial Value
0
0
0
0
0
0
0
0



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