attiny24v ATMEL Corporation, attiny24v Datasheet - Page 110

• Manufacturer Part Number: attiny24v
• Description: 8-bit Avr Microcontroller With 2/4/8k Bytes Insystem Programmable Flash
• Manufacturer: ATMEL Corporation

12.11.2
110
ATtiny24/44/84
TCCR1B – Timer/Counter1 Control Register B
• Bit 1:0 – WGM11:0: Waveform Generation Mode
Combined with the WGM13:2 bits found in the TCCR1B Register, these bits control the counting
sequence of the counter, the source for maximum (TOP) counter value, and what type of wave-
form generation to be used, see
Timer/Counter unit are: Normal mode (counter), Clear Timer on Compare match (CTC) mode,
and three types of Pulse Width Modulation (PWM) modes.
Table 12-5.
• Bit 7 – ICNC1: 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 (ICP1) is filtered. The filter function requires four
successive equal valued samples of the ICP1 pin for changing its output. The Input Capture is
therefore delayed by four Oscillator cycles when the noise canceler is enabled.
• Bit 6 – ICES1: Input Capture Edge Select
This bit selects which edge on the Input Capture pin (ICP1) that is used to trigger a capture
event. When the ICES1 bit is written to zero, a falling (negative) edge is used as trigger, and
when the ICES1 bit is written to one, a rising (positive) edge will trigger the capture.
Bit
0x2E (0x4E)
Read/Write
Initial Value
Mode
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
WGM
13:10
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Waveform Generation Modes
ICNC1
R/W
7
0
Mode of
Operation
Normal
PWM, Phase Correct, 8-bit
PWM, Phase Correct, 9-bit
PWM, Phase Correct, 10-bit
CTC (
Fast PWM, 8-bit
Fast PWM, 9-bit
Fast PWM, 10-bit
PWM, Phase & Freq. Correct
PWM, Phase & Freq. Correct
PWM, Phase Correct
PWM, Phase Correct
CTC (
(Reserved)
Fast PWM
Fast PWM
ICES1
R/W
Clear Timer on Compare
Clear Timer on Compare
6
0
Table 12-5 on page
R
5
–
0
WGM13
R/W
4
0
)
)
WGM12
R/W
110. Modes of operation supported by the
3
0
TOP
0xFFFF
0x00FF
0x01FF
0x03FF
OCR1A
0x00FF
0x01FF
0x03FF
ICR1
OCR1A
ICR1
OCR1A
ICR1
–
ICR1
OCR1A
(“Modes of Operation” on page
CS12
R/W
2
0
Update of
OCR1
Immediate
TOP
TOP
TOP
Immediate
TOP
TOP
TOP
BOTTOM
BOTTOM
TOP
TOP
Immediate
–
TOP
TOP
CS11
R/W
1
0
x
at
CS10
R/W
0
0
TOV1 Flag
Set on
MAX
BOTTOM
BOTTOM
BOTTOM
MAX
TOP
TOP
TOP
BOTTOM
BOTTOM
BOTTOM
BOTTOM
MAX
–
TOP
TOP
8006H–AVR–10/09
TCCR1B
96).