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ATMEGA640 Datasheet(PDF) 157 Page - Microchip Technology

Part # ATMEGA640
Description  8-bit Microcontroller with 16/32/64KB In-System Programmable Flash
PDF  436 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATMEGA640 Datasheet(HTML) 157 Page - Microchip Technology

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]
DS40002211A
See TCCRnA Register description.
• Bit 2:0 – CSn2:0: Clock Select
The three clock select bits select the clock source to be used by the Timer/Counter, see Figure 17-10 and Figure
17-11 on page 152.
If external pin modes are used for the Timer/Countern, transitions on the Tn pin will clock the counter even if the
pin is configured as an output. This feature allows software control of the counting.
17.11.9
TCCR1C – Timer/Counter 1 Control Register C
17.11.10 TCCR3C – Timer/Counter 3 Control Register C
17.11.11 TCCR4C – Timer/Counter 4 Control Register C
17.11.12 TCCR5C – Timer/Counter 5 Control Register C
Table 17-6.
Clock Select Bit Description
CSn2
CSn1
CSn0
Description
0
0
0
No clock source. (Timer/Counter stopped)
001
clkI/O/1 (No prescaling
010
clkI/O/8 (From prescaler)
011
clkI/O/64 (From prescaler)
100
clkI/O/256 (From prescaler)
101
clkI/O/1024 (From prescaler)
1
1
0
External clock source on Tn pin. Clock on falling edge
1
1
1
External clock source on Tn pin. Clock on rising edge
Bit
765
4
3
2
1
0
(0x82)
FOC1A
FOC1B
FOC1C
–
–
–
–
–
TCCR1C
Read/Write
W
W
W
R
R
R
R
R
Initial Value
0
0
0
0
0
0
0
0
Bit
765
4
3
2
1
0
(0x92)
FOC3A
FOC3B
FOC3C
–
–
–
–
–
TCCR3C
Read/Write
W
W
W
R
R
R
R
R
Initial Value
0
0
0
0
0
0
0
0
Bit
765
4
3
2
1
0
(0xA2)
FOC4A
FOC4B
FOC4C
–
–
–
–
–
TCCR4C
Read/Write
W
W
W
R
R
R
R
R
Initial Value
0
0
0
0
0
0
0
0
Bit
765
4
3
2
1
0
(0x122)
FOC5A
FOC5B
FOC3C
–
–
–
–
–
TCCR5C
Read/Write
W
W
W
R
R
R
R
R
Initial Value
0
0
0
0
0
0
0
0



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