ATtiny167 Atmel Corporation, ATtiny167 Datasheet - Page 123

• 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

12.9.1
12.9.2
8265B–AVR–09/10
Normal Mode
Clear Timer on Compare Match (CTC) Mode
or toggle at a compare match
bits over control the setting of the COM1A/B[1:0] bits as shown in
For detailed timing information refer to
The simplest mode of operation is the Normal mode (WGM1[3:0] = 0). In this mode the count-
ing direction is always up (incrementing), and no counter clear is performed. The counter
simply overruns when it passes its maximum 16-bit value (MAX = 0xFFFF) and then restarts
from the BOTTOM (0x0000). In normal operation the Timer/Counter Overflow Flag (TOV1) will
be set in the same timer clock cycle as the TCNT1 becomes zero. The TOV1 flag in this case
behaves like a 17th bit, except that it is only set, not cleared. However, combined with the
timer overflow interrupt that automatically clears the TOV1 flag, the timer resolution can be
increased by software. There are no special cases to consider in the Normal mode, a new
counter value can be written anytime.
The Input Capture unit is easy to use in Normal mode. However, observe that the maximum
interval between the external events must not exceed the resolution of the counter. If the inter-
val between events are too long, the timer overflow interrupt or the prescaler must be used to
extend the resolution for the capture unit.
The Output Compare units can be used to generate interrupts at some given time. Using the
Output Compare to generate waveforms in Normal mode is not recommended, since this will
occupy too much of the CPU time.
In Clear Timer on Compare or CTC mode (WGM1[3:0] = 4 or 12), the OCR1A or ICR1 Regis-
ter are used to manipulate the counter resolution. In CTC mode the counter is cleared to zero
when the counter value (TCNT1) matches either the OCR1A (WGM1[3:0] = 4) or the ICR1
(WGM1[3:0] = 12). The OCR1A or ICR1 define the top value for the counter, hence also its
resolution. This mode allows greater control of the compare match output frequency. It also
simplifies the operation of counting external events.
The timing diagram for the CTC mode is shown in
increases until a compare match occurs with either OCR1A or ICR1, and then counter
(TCNT1) is cleared.
Figure 12-7. CTC Mode, Timing Diagram
TCNTn
OCnAi
(Toggle)
Period
1
(See ”Compare Match Output Unit” on page
2
“Timer/Counter Timing Diagrams” on page
3
4
Figure
12-7. The counter value (TCNT1)
Figure 12-6 on page
OCnA Interrupt Flag Set
or ICFn Interrupt Flag Set
(Interrupt on TOP)
(COMnA1:0 = 1)
120.). The OCnxi
130.
122.
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