ATTINY20-XU Atmel, ATTINY20-XU Datasheet - Page 94

• Manufacturer Part Number: ATTINY20-XU
• Description: MCU AVR 2KB FLASH 12MHZ 14TSSOP
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY20-XU

• 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: *
• Processor Series: ATtiny
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: SPI, TWI
• Maximum Clock Frequency: 12 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

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ATtiny20
Figure 12-10. Timer/Counter Timing Diagram, Setting of OCF1x, no Prescaling
Figure 12-11
Figure 12-11. Timer/Counter Timing Diagram, Setting of OCF1x, with Prescaler (f
Figure 12-12
frequency correct PWM mode the OCR1x Register is updated at BOTTOM. The timing diagrams
will be the same, but TOP should be replaced by BOTTOM, TOP-1 by BOTTOM+1 and so on.
The same renaming applies for modes that set the TOV1 flag at BOTTOM.
(PC and PFC PWM)
OCRnx
TCNTn
and ICFn
OCFnx
(clk
(CTC and FPWM)
TOVn
(Update at TOP)
clk
clk
I/O
I/O
TCNTn
TCNTn
OCRnx
Tn
as TOP)
(clk
/8)
clk
clk
I/O
(FPWM)
I/O
Tn
/1)
(if used
shows the same timing data, but with the prescaler enabled.
shows the count sequence close to TOP in various modes. When using phase and
OCRnx - 1
TOP - 1
TOP - 1
Old OCRnx Value
OCRnx
OCRnx Value
TOP
TOP
OCRnx + 1
BOTTOM
TOP - 1
New OCRnx Value
BOTTOM + 1
OCRnx + 2
clk_I/O
8235B–AVR–04/11
TOP - 2
/8)