ATtiny26 Atmel Corporation, ATtiny26 Datasheet - Page 75

• Manufacturer Part Number: ATtiny26
• Manufacturer: Atmel Corporation

Specifications of ATtiny26

• Flash (kbytes): 2 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 11
• 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: No
• Crypto Engine: No
• Sram (kbytes): 0.12
• Eeprom (bytes): 128
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• 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: 3
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

1477K–AVR–08/10
Table 35. Compare Mode Select in PWM Mode
Note that in PWM mode, writing to the Output Compare Registers OCR1A or OCR1B, the data
value is first transferred to a temporary location. The value is latched into OCR1A or OCR1B
when the Timer/Counter reaches OCR1C. This prevents the occurrence of odd-length PWM
pulses (glitches) in the event of an unsynchronized OCR1A or OCR1B. See Figure 42 for an
example.
Figure 42. Effects of Unsynchronized OCR Latching
During the time between the write and the latch operation, a read from OCR1A or OCR1B will
read the contents of the temporary location. This means that the most recently written value
always will read out of OCR1A or OCR1B.
When OCR1A or OCR1B contain $00 or the top value, as specified in OCR1C Register, the out-
p u t P B 1 ( O C 1 A ) o r P B 3 ( O C 1 B ) i s h e l d l o w o r h i g h a c c o r d i n g t o t h e s e t t i n g s o f
COM1A1/COM1A0. This is shown in Table 36.
COM1x1
0
0
1
1
Unsynchronized OC1x Latch
Synchronized OC1x Latch
COM1x0
0
1
0
1
Effect on Output Compare Pins
OC1x not connected.
OC1x not connected.
OC1x cleared on compare match. Set when TCNT1 = $01.
OC1x set one prescaled cycle after compare match. Cleared when
TCNT1 = $00.
OC1x cleared on compare match. Set when TCNT1 = $01.
OC1x not connected.
OC1x set one prescaled cycle after compare match. Cleared when
TCNT = $00
OC1x not connected.
Glitch
Compare Value changes
Compare Value Changes
Counter Value
Compare Value
PWM Output OC1x
Counter Value
Compare Value
PWM Output OC1x
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