Datasheet

162
ATmega640/1280/1281/2560/2561
2549K–AVR–01/07
TCCR1B – Timer/Counter 1
Control Register B
TCCR3B – Timer/Counter 3
Control Register B
TCCR4B – Timer/Counter 4
Control Register B
TCCR5B – Timer/Counter 5
Control Register B
• Bit 7 – ICNCn: Input Capture Noise Canceler
Setting this bit (to one) activates the Input Capture Noise Canceler. When the Noise
Canceler is activated, the input from the Input Capture Pin (ICPn) is filtered. The filter
function requires four successive equal valued samples of the ICPn pin for changing its
output. The input capture is therefore delayed by four Oscillator cycles when the noise
canceler is enabled.
• Bit 6 – ICESn: Input Capture Edge Select
This bit selects which edge on the Input Capture Pin (ICPn) that is used to trigger a cap-
ture event. When the ICESn bit is written to zero, a falling (negative) edge is used as
trigger, and when the ICESn bit is written to one, a rising (positive) edge will trigger the
capture.
When a capture is triggered according to the ICESn setting, the counter value is copied
into the Input Capture Register (ICRn). The event will also set the Input Capture Flag
(ICFn), and this can be used to cause an Input Capture Interrupt, if this interrupt is
enabled.
When the ICRn is used as TOP value (see description of the WGMn3:0 bits located in
the TCCRnA and the TCCRnB Register), the ICPn is disconnected and consequently
the input capture function is disabled.
• Bit 5 – Reserved Bit
This bit is reserved for future use. For ensuring compatibility with future devices, this bit
must be written to zero when TCCRnB is written.
• Bit 4:3 – WGMn3:2: Waveform Generation Mode
See TCCRnA Register description.
Bit 76543210
(0x81) ICNC1 ICES1 – WGM13 WGM12 CS12 CS11 CS10 TCCR1B
Read/Write R/W R/W RR/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
Bit 76543210
(0x91) ICNC3 ICES3 – WGM33 WGM32 CS32 CS31 CS30 TCCR3B
Read/Write R/W R/W RR/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
Bit 76543210
(0xA1) ICNC4 ICES4 – WGM43 WGM42 CS42 CS41 CS40 TCCR4B
Read/Write R/W R/W RR/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
Bit 76543210
(0x121) ICNC5 ICES5 – WGM53 WGM52 CS52 CS51 CS50 TCCR5B
Read/Write R/W R/W RR/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0