ATtiny167 Atmel Corporation, ATtiny167 Datasheet - Page 127

• Manufacturer Part Number: ATtiny167
• Manufacturer: Atmel Corporation

Specifications of ATtiny167

• Flash (kbytes): 16 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: 2
• Twi (i2c): 1
• Uart: 1
• Lin: 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 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 3
• Input Capture Channels: 1
• Pwm Channels: 9
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

8265B–AVR–09/10
In phase correct PWM mode the counter is incremented until the counter value matches either
one of the fixed values 0x00FF, 0x01FF, or 0x03FF (WGM1[3:0] = 1, 2, or 3), the value in
ICR1 (WGM1[3:0] = 10), or the value in OCR1A (WGM1[3:0] = 11). The counter has then
reached the TOP and changes the count direction. The TCNT1 value will be equal to TOP for
one timer clock cycle. The timing diagram for the phase correct PWM mode is shown on
ure
TOP. The TCNT1 value is in the timing diagram shown as a histogram for illustrating the
dual-slope operation. The diagram includes non-inverted and inverted PWM outputs. The
small horizontal line marks on the TCNT1 slopes represent compare matches between
OCR1A/B and TCNT1. The OC1A/B interrupt flag will be set when a compare match occurs.
Figure 12-9. Phase Correct PWM Mode, Timing Diagram
The Timer/Counter Overflow Flag (TOV1) is set each time the counter reaches BOTTOM.
When either OCR1A or ICR1 is used for defining the TOP value, the OC1A or ICF1 flag is set
accordingly at the same timer clock cycle as the OCR1A/B Registers are updated with the
double buffer value (at TOP). The interrupt flags can be used to generate an interrupt each
time the counter reaches the TOP or BOTTOM value.
When changing the TOP value the program must ensure that the new TOP value is higher or
equal to the value of all of the Compare Registers. If the TOP value is lower than any of the
Compare Registers, a compare match will never occur between the TCNT1 and the
OCR1A/B. Note that when using fixed TOP values, the unused bits are masked to zero when
any of the OCR1A/B Registers are written. As the third period shown in
changing the TOP actively while the Timer/Counter is running in the phase correct mode can
result in an unsymmetrical output. The reason for this can be found in the time of update of the
OCR1A/B Register. Since the OCR1A/B update occurs at TOP, the PWM period starts and
ends at TOP. This implies that the length of the falling slope is determined by the previous
TOP value, while the length of the rising slope is determined by the new TOP value. When
these two values differ the two slopes of the period will differ in length. The difference in length
gives the unsymmetrical result on the output.
12-9. The figure shows phase correct PWM mode when OCR1A or ICR1 is used to define
TCNTn
OCnxi
OCnxi
Period
1
2
3
4
OCRnx/TOP Update and
OCnA Interrupt Flag Set
or ICFn Interrupt Flag Set
(Interrupt on TOP)
TOVn Interrupt Flag Set
(Interrupt on Bottom)
Figure 12-9
(COMnx[1:0] = 2)
(COMnx[1:0] = 3)
illustrates,
Fig-
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