ATtiny861 Automotive Atmel Corporation, ATtiny861 Automotive Datasheet - Page 102

• Manufacturer Part Number: ATtiny861 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATtiny861 Automotive

• Flash (kbytes): 8 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 16
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 150
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

16.6.1
16.7
16.7.1
102
Modes of Operation
ATtiny261/ATtiny461/ATtiny861
Compare Output Mode and Waveform Generation
Normal Mode
The Waveform Generator uses the COM1x1:0 bits differently in Normal mode and PWM modes.
For all modes, setting the COM1x1:0 = 0 tells the Waveform Generator that no action on the
OCW1x Output is to be performed on the next Compare Match. For compare output actions in
the non-PWM modes refer to
on page
A change of the COM1x1:0 bits state will have effect at the first Compare Match after the bits are
written. For non-PWM modes, the action can be forced to have immediate effect by using the
FOC1x strobe bits.
The mode of operation, i.e., the behavior of the Timer/Counter and the Output Compare pins, is
defined by the combination of the Waveform Generation mode (bits PWM1x and WGM10) and
Compare Output mode (COM1x1:0) bits. The Compare Output mode bits do not affect the
counting sequence, while the Waveform Generation mode bits do. The COM1x1:0 bits control
whether the PWM output generated should be inverted, non-inverted or complementary. For
non-PWM modes the COM1x1:0 bits control whether the output should be set, cleared, or tog-
gled at a Compare Match.
The simplest mode of operation is the Normal mode (PWM1x = 0), the counter counts from
BOTTOM to TOP (defined as OCR1C) then restarts from BOTTOM. The OCR1C defines the
TOP value for the counter, hence also its resolution, and allows control of the Compare Match
output frequency. In toggle Compare Output Mode the Waveform Output (OCW1x) is toggled at
Compare Match between TCNT1 and OCR1x. In non-inverting Compare Output Mode the
Waveform Output is cleared on the Compare Match. In inverting Compare Output Mode the
Waveform Output is set on Compare Match.
The timing diagram for the Normal mode is shown in
that is shown as a histogram in the timing diagram is incremented until the counter value
matches the TOP value. The counter is then cleared at the following clock cycle The diagram
includes the Waveform Output (OCW1x) in toggle Compare Mode. The small horizontal line
marks on the TCNT1 slopes represent Compare Matches between OCR1x and TCNT1.
Figure 16-10. Normal Mode, Timing Diagram
OCWnx
(COMnx=1)
TCNTn
Period
115, and for the Phase and Frequency Correct PWM refer to
1
Table 16-6 on page
2
3
115. For fast PWM mode, refer to
Figure
4
16-10. The counter value (TCNT1)
Table 16-8 on page
TOVn Interrupt Flag Set
OCnx Interrupt Flag Set
7753F–AVR–01/11
Table 16-7
116.