ATTINY20-MMHR Atmel, ATTINY20-MMHR Datasheet - Page 100

• Manufacturer Part Number: ATTINY20-MMHR
• Description: MCU AVR 2KB FLASH 12MHZ 20QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY20-MMHR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 12MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 12
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

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).