ATTINY461-20SU Atmel, ATTINY461-20SU Datasheet - Page 101

• Manufacturer Part Number: ATTINY461-20SU
• Description: IC MCU AVR 4K FLASH 20MHZ 20SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY461-20SU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SOIC (7.5mm Width)
• Processor Series: ATTINY4x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: 2-Wire, SPI, USI
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 2
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 16 Channel
• Package: 20SOIC
• Device Core: AVR
• Family Name: ATtiny
• Maximum Speed: 20 MHz
• For Use With: ATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIPATAVRBC100 - REF DESIGN KIT BATTERY CHARGER770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2588E–AVR–08/10
DAC applications. High frequency allows physically small sized external components (coils,
capacitors), and therefore reduces total system cost.
The timing diagram for the fast PWM mode is shown in
mented until the counter value matches the TOP value. The counter is then cleared at the
following timer clock cycle. The TCNT1 value is in the timing diagram shown as a histogram for
illustrating the single-slope operation. The diagram includes the Waveform Output in non-
inverted and inverted Compare Output modes. The small horizontal line marks on the TCNT1
slopes represent Compare Matches between OCR1x and TCNT1.
Figure 12-12. Fast PWM Mode, Timing Diagram
The Timer/Counter Overflow Flag (TOV1) is set each time the counter reaches TOP. If the inter-
rupt is enabled, the interrupt handler routine can be used for updating the compare value.
In fast PWM mode, the compare unit allows generation of PWM waveforms on the OC1x pins.
Setting the COM1x1:0 bits to two will produce a non-inverted PWM and setting the COM1x1:0 to
three will produce an inverted PWM output. Setting the COM1x1:0 bits to one will enable com-
plementary Compare Output mode and produce both the non-inverted (OC1x) and inverted
output (OC1x). The actual value will only be visible on the port pin if the data direction for the
port pin is set as output. The PWM waveform is generated by setting (or clearing) the Waveforn
Output (OCW1x) at the Compare Match between OCR1x and TCNT1, and clearing (or setting)
the Waveform Output at the timer clock cycle the counter is cleared (changes from TOP to
BOTTOM).
The PWM frequency for the output can be calculated by the following equation:
The N variable represents the number of steps in single-slope operation. The value of N equals
either to the TOP value.
The extreme values for the OCR1C Register represents special cases when generating a PWM
waveform output in the fast PWM mode. If the OCR1C is set equal to BOTTOM, the output will
be a narrow spike for each MAX+1 timer clock cycle. Setting the OCR1C equal to MAX will result
TCNTn
OCWnx
(COMnx1:0 = 2)
OCWnx
(COMnx1:0 = 3)
Period
1
2
3
f
OCnxPWM
4
=
5
f
------------ -
clkT1
N
6
Figure
7
12-12. The counter is incre-
OCRnx Interrupt Flag Set
OCRnx Update and
TOVn Interrupt Flag Set
101