ATtiny20 Atmel Corporation, ATtiny20 Datasheet - Page 100

• Manufacturer Part Number: ATtiny20
• Manufacturer: Atmel Corporation

Specifications of ATtiny20

• Flash (kbytes): 2 Kbytes
• Pin Count: 14
• Max. Operating Frequency: 12 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 5
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 12
• Ext Interrupts: 12
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.12
• Self Program Memory: NO
• 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: 4
• Input Capture Channels: 1
• Pwm Channels: 3
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

100
ATtiny20
Table 12-4
phase and frequency correct PWM mode.
Table 12-4.
Note:
• Bits 1:0 – WGM1[1:0]: Waveform Generation Mode
Combined with the WGM1[3:2] bits found in the TCCR1B Register, these bits control the count-
ing sequence of the counter, the source for maximum (TOP) counter value, and what type of
waveform generation to be used, see
Timer/Counter unit are: Normal mode (counter), Clear Timer on Compare match (CTC) mode,
and three types of Pulse Width Modulation (PWM) modes.
Table 12-5.
Mode
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
COM1A1
COM1B1
0
0
1
1
A special case occurs when OCR1A/OCR1B equals TOP and COM1A1/COM1B1 is set.
Correct PWM Mode” on page 90
WGM1
shows COM1x[1:0] bit functionality when WGM1[3:0] bits are set to phase correct or
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
[3:0]
Compare Output Mode, Phase Correct and Phase & Frequency Correct PWM
Waveform Generation Modes
Mode of
Operation
Normal
PWM, Phase Correct, 8-bit
PWM, Phase Correct, 9-bit
PWM, Phase Correct, 10-bit
CTC (
Fast PWM, 8-bit
Fast PWM, 9-bit
Fast PWM, 10-bit
PWM, Phase & Freq. Correct
PWM, Phase & Freq. Correct
PWM, Phase Correct
PWM, Phase Correct
CTC (
(Reserved)
Fast PWM
Fast PWM
COM1A0
COM1B0
0
1
0
1
Clear Timer on Compare
Clear Timer on Compare
Description
Normal port operation, OC1A/OC1B disconnected
WGM13=0: Normal port operation, OC1A/OC1B disconnected
WGM13=1: Toggle OC1A on Compare Match, OC1B reserved
Clear OC1A/OC1B on Compare Match when up-counting
Set OC1A/OC1B on Compare Match when downcounting
Set OC1A/OC1B on Compare Match when up-counting
Clear OC1A/OC1B on Compare Match when downcounting
for more details.
Table
12-5. Modes of operation supported by the
)
)
TOP
0xFFFF
0x00FF
0x01FF
0x03FF
OCR1A
0x00FF
0x01FF
0x03FF
ICR1
OCR1A
ICR1
OCR1A
ICR1
–
ICR1
OCR1A
(“Modes of Operation” on page
Update of
OCR1
Immediate
TOP
TOP
TOP
Immediate
TOP
TOP
TOP
BOTTOM
BOTTOM
TOP
TOP
Immediate
–
TOP
TOP
x
at
TOV1 Flag
Set on
MAX
BOTTOM
BOTTOM
BOTTOM
MAX
TOP
TOP
TOP
BOTTOM
BOTTOM
BOTTOM
BOTTOM
MAX
–
TOP
TOP
8235B–AVR–04/11
“Phase
86).