AT90PWM81-16MF Atmel, AT90PWM81-16MF Datasheet - Page 96

• Manufacturer Part Number: AT90PWM81-16MF
• Description: IC MCU AVR 8K FLASH ISP 32QFN
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

Specifications of AT90PWM81-16MF

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, PWM, WDT
• Number Of I /o: 20
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 32-MLF®, QFN
• For Use With: ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

11.8
11.8.1
96
16-bit Timer/Counter Register Description
AT90PWM81
Timer/Counter1 Control Register B – TCCR1B
• 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.
When a capture is triggered according to the ICES1 setting, the counter value is copied into the Input Cap-
ture Register (ICR1). The event will also set the Input Capture Flag (ICF1), and this can be used to cause
an Input Capture Interrupt, if this interrupt is enabled.
When the ICR1 is used as TOP value (see description of the WGM13:0 bits located in the TCCR1A and
the TCCR1B Register), the ICP1 is disconnected and consequently the Input Capture function is disabled.
• Bit 5 – Reserved
• Bit 4 – WGM13: Waveform Generation Mode
See the table below for the modes definition
Table 11-1.
• Bit 3 – Reserved
• Bit 2:0 – CS12:0: Clock Select
The three Clock Select bits select the clock source to be used by the Timer/Counter, see Table 11-2.
Table 11-2.
Bit
Read/Write
Initial Value
Mode
CS12
12
0
0
0
0
0
WGM13
CS11
0
1
7
ICNC1
R/W
0
Waveform Generation Mode Bit Description
Clock Select Bit Description
0
0
1
1
Timer/Counter Mode of
Operation
Normal
CTC
CS10
6
ICES1
R/W
0
0
1
0
1
Description
No clock source (Timer/Counter stopped).
clk
Reserved
Reserved
5
-
R
0
I/O
/1 (No prescaling)
4
WGM13
R/W
0
3
-
R
0
TOP
0xFFFF
ICR1
R/W
2
CS12
0
TOV1 Flag
Set on
MAX
MAX
1
CS11
R/W
0
0
CS10
R/W
0
7734P–AVR–08/10
TCCR1B