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ATtiny Microcontroller Comparison Chart
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ATtiny (also known as TinyAVR) are a subfamily of the popular 8-bit AVR microcontrollers, which typically has fewer features, fewer I/O pins, and less memory than other AVR series chips. The first members of this family were released in 1999 by Atmel (later acquired by Microchip Technology in 2016).

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Table of Contents

    1. Features

    ATtiny microcontrollers specifically excludes various common features, such as: USB peripheral, DMA controller, crypto engine, or an external memory bus.

    The following table summarizes common features of the ATtiny microcontrollers, for easy comparison. This table is not meant to be an unabridged feature list.

    Device (family)[1] Max
    clock
    (MHz)
    Flash
    (KiB)
    SRAM
    (bytes)
    EEPROM
    (bytes)
    UART I²C
    (TWI)
    SPI Timers 8/12/16
    (bits)
    PWM [2] ADC pins GPIO pins IC Packages GCC arch ID [3][4] Pgm
    Dbg
    Refs
    ATtiny11, ATtiny11L 6, 2 1 No No No No No 1 / 0 / 0 No No 5 DIP-8N, SO200-8 avr1 HVSP [5]
    ATtiny12, ATtiny12L, ATtiny12V 8, 1.2 1 No 64 No No No 1 / 0 / 0 No No 5 DIP-8N, SO200-8 avr1 ISP, HVSP [5]
    ATtiny15L 1.6 1 No 64 No No No 2 / 0 / 0 yes 4 6 DIP-8N, SO200-8 avr1 ISP, HVSP [6]
    ATtiny28L, ATtiny28V 4, 1.2 2 No No No No No 1 / 0 / 0 1 x 1 No 11 DIP-28N, TQFP-32, QFN-32 avr1 HVPP [7]
                                   
    ATtiny22, ATtiny22L 8, 4 2 128 128 No No No 1 / 0 / 0 No No 5 DIP-8N, SO200-8 avr2 ISP, HVSP [8]
    ATtiny26, ATtiny26L 16, 8 2 128 128 USI* master, slave* master, slave* 2 / 0 / 0 1 x 2 11 16 DIP-20N, SO300-20, QFN-32 avr2 ISP, HVPP [9]
                                   
    ATtiny13, ATtiny13V, ATtiny13A 20, 10 1 64 64 No No No 1 / 0 / 0 1 x 2 4 6 DIP-8N, SO150-8, SO209-8, VQFN-10, WQFN-20 avr2.5 ISP, dW, HVSP [10] [11] [12]
    ATtiny24, ATtiny24V, ATtiny24A, ATtiny44, ATtiny44V, ATtiny44A, ATtiny84, ATtiny84V, ATtiny84A 20, 10 2, 4, 8 128, 256, 512 128, 256, 512 USI* master, slave* master, slave* 1 / 0 / 1 2 x 2 8 12 DIP-14N, SO150-14, QFN-20, VQFN-20, UFBGA-15 avr2.5 ISP, dW, HVSP [13] [14] [15] [16] [17] [18]
    ATtiny25, ATtiny25V, ATtiny45, ATtiny45V, ATtiny85, ATtiny85V 20, 10 2, 4, 8 128, 256, 512 128, 256, 512 USI* master, slave* master, slave* 2[19] / 0 / 0 2 x 2 [20][21] 4 6 DIP-8N, SO208-8, TSSOP-8, QFN-20 avr2.5 ISP, dW, HVSP [22] [23] [24]
    ATtiny43U 8 4 256 64 USI* master, slave* master, slave* 2 / 0 / 0 2 x 2 4 16 SO300-20, QFN-20 avr2.5 ISP, dW, HVPP [25]
    ATtiny48, ATtiny88 12 4, 8 256, 512 64 No master, slave master, slave 1 / 0 / 1 1 x 2 6 / 8 24, 28 DIP-28N, QFN-28, TQFP-32, QFN-32, UFBGA-32 avr2.5 ISP, dW, HVPP [26] [27]
    ATtiny87, ATtiny167 16 8, 16 512 512 USI*, UART* No master, slave 1 / 0 / 1 1 x 1 11 16 SO300-20, TSSOP-20, VQFN-32 avr2.5, avr35 ISP, dW, HVPP [28] [29]
    ATtiny261, ATtiny261A, ATtiny461, ATtiny461A, ATtiny861, ATtiny861A 20 2, 4, 8 128, 256, 512 128, 256, 512 USI* master, slave* master, slave* 1[30] / 0 / 1 1 x 3[31] 11 16 DIP-20N, SO300-20, TSSOP-20, QFN-32 avr2.5 ISP, dW, HVPP [32] [33] [34] [35] [36]
    ATtiny441, ATtiny841 16 4, 8 256, 512 256, 512 2 USART* slave master, slave 1 / 0 / 2 2 x 2 12 12 SO150-14, QFN-20, VQFN-20 avr2.5 ISP, dW, HVSP [37] [38]
    ATtiny828 20 8 512 256 USART* slave master, slave 1 / 0 / 1 2 x 2 28 28 TQFP-32, QFN-32 avr2.5 ISP, dW, HVPP [39]
    ATtiny1634 12 16 1024 256 USI*, 2 USART* slave master* 1 / 0 / 1 2 x 2 12 18 SO300-20, QFN-20 avr35 ISP, dW, HVPP [40]
    ATtiny2313, ATtiny2313V, ATtiny2313A, ATtiny4313 20 2, 4 128, 256 128, 256 USI*, USART* master, slave* master, slave* 1 / 0 / 1 2 x 2 No 18 DIP-20N, SO300-20, VQFN-20 avr2.5 ISP, dW, HVPP [41] [42] [43] [44]
                                   
    ATtiny4, ATtiny5, ATtiny9, ATtiny10 12 0.5 / 1 32 No No No No 0 / 0 / 1 1 x 2 4 [45] 4 SOT23-6, UDFN-8 avrtiny10 TPI [46] [47] [48] [49]
    ATtiny20 12 2 128 No No slave master, slave 1 / 0 / 1 2 x 2 8 12 SO150-14, TSSOP-14, VQFN-20, UFBGA-15, WLCSP-12 avrtiny10 TPI [50]
    ATtiny40 12 4 256 No No slave master, slave 1 / 0 / 1 1 x 2 12 18 SO300-20, TSSOP-20, VQFN-20 avrtiny10 TPI [51]
    ATtiny102(F) 12 1 32 No USART* No master* 0 / 0 / 1 yes 5 6 SO150-8, UDFN-8 ? TPI [52]
    ATtiny104(F) 12 1 32 No USART* No master* 0 / 0 / 1 yes 9 12 SO150-14 ? TPI [53]
                                   
    ATtiny202, ATtiny402 (0-series) 20 2, 4 128, 256 64, 128 USART* master, slave master, slave 0 / 0 / 2 / R yes 6 6 SO150-8 avrxmega3 UPDI [54] [55]
    ATtiny204, ATtiny404, ATtiny804, ATtiny1604 (0-series) 20 2, 4, 8, 16 128, 256, 512, 1024 64, 128, 256 USART* master, slave master, slave 0 / 0 / 2 / R yes 10 12 SO150-14 avrxmega3 UPDI [56] [57] [58] [59]
    ATtiny406, ATtiny806, ATtiny1606 (0-series) 20 4, 8, 16 256, 512, 1024 128, 256 USART* master, slave master, slave 0 / 0 / 2 / R yes 12 18 SO300-20, VQFN-20 avrxmega3 UPDI [60] [61] [62]
    ATtiny807, ATtiny1607 (0-series) 20 8, 16 512, 1024 128, 256 USART* master, slave master, slave 0 / 0 / 2 / R yes 12 22 VQFN-24 avrxmega3 UPDI [63] [64]
                                   
    ATtiny212, ATtiny412 (1-series) 20 2, 4 128, 256 64, 128 USART* master, slave master, slave 0 / 1 / 2 / R yes 6 6 SO150-8 avrxmega3 UPDI [65] [66]
    ATtiny214, ATtiny414, ATtiny814, ATtiny1614 (1-series) 20 2, 4, 8, 16 128, 256, 512, 2048 64, 128, 256 USART* master, slave master, slave 0 / 1 / 2 / R yes 10 12 SO150-14 avrxmega3 UPDI [67] [68] [69] [70]
    ATtiny416, ATtiny816, ATtiny1616, ATtiny3216 (1-series) 20 4, 8, 16, 32 256, 512, 2048 128, 256 USART* master, slave master, slave 0 / 1 / 2or3 / R yes 12 18 SO300-20, QFN-20, VQFN-20 avrxmega3 UPDI [71][72][73][74]
    ATtiny417, ATtiny817, ATtiny1617, ATtiny3217 (1-series) 20 4, 8, 16, 32 256, 512, 2048 128, 256 USART* master, slave master, slave 0 / 1 / 2 / R yes 12 22 VQFN-24, QFN-24 avrxmega3 UPDI [75][76][77][78]
                                   
    ATtiny424, ATtiny824, ATtiny1624, ATtiny3224 (2-series) 20 4, 8, 16, 32 512, 1024, 2048, 3072 128, 128, 256, 256 2 USART* yes yes 0 / 0 / 3 / R yes 9 12 SO-14, TSSOP-14 ? UPDI [79][80]
    ATtiny426, ATtiny826, ATtiny1626, ATtiny3226 (2-series) 20 4, 8, 16, 32 512, 1024, 2048, 3072 128, 128, 256, 256 2 USART* yes yes 0 / 0 / 3 / R yes 15 18 SO-20, SSTOP-20, VQFN-20 ? UPDI [81][82]
    ATtiny427, ATtiny827, ATtiny1627, ATtiny3227 (2-series) 20 4, 8, 16, 32 512, 1024, 2048, 3072 128, 128, 256, 256 2 USART* yes yes 0 / 0 / 3 / R yes 15 22 VQFN-24 ? UPDI [83][84]
    Device (family) Max clock
    (MHz)
    Flash
    (KiB)
    SRAM
    (bytes)
    EEPROM
    (bytes)
    UART I²C
    (TWI)
    SPI Timers 8/12/16/R
    (bits)
    PWM ADC pins GPIO pins IC Packages GCC arch ID Pgm
    Dbg
    Refs
    Notes

     

    1. timers x waveform generators
    2. timer0 can use clocks up to the core clock, timer1 can use clocks up to 64MHz
    3. 4 pins are usable, but only 3 unique generators can be attached. The 4th pin would be the inverse of OC1B on the 3rd pin.
    4. Inverted outputs with configured dead zones can be set up for the 64MHz-capable timer1.
    5. timer/counter1 is a 10-bit counter that can use clocks to 64MHz.
    6. The PWM channels are based on the 10 bit counter with a maximum of 64MHz clock. Each PWM channel can generate two outputs, normal and inverted, on distinct IO pins. Each pair of outputs can be configured to have a dead-time between their on-states.
    7. ADC only on ATtiny5/10, and channels are 8 bits instead of 10
    • Package column - the number after the dash is the number of pins on the package. DIP packages in this table are 0.3 inches (7.62 mm) row-to-row. SOwww means SOIC package with a case width of 'www' in thousandth of an inch. Though some package types are known by more than one name, a common name was chosen to make it easier to compare packages.
    • UART/I²C/SPI columns - green cell means a dedicated peripheral, * yellow cell means a multi-feature peripheral that is chosen by setting configuration bits. Most USART peripherals support a minimum choice between UART or SPI, where as some might support additional choices, such as LIN, IrDA, RS-485.
    • Timers column - recent families add a 12-bit timer, plus a 16-bit Real Time Counter (RTC) that is driven by a 32.768KHz clock (feature designated with 'R' in the table).
    • ADC chans column - the total number of analog channels that are multiplex into the ADC input. Most parts have one ADC, a few have two ADC.
    • Pgm/Dbg column - flash programming and debugging protocols: HVPP means High Voltage Parallel Programming 12V protocol, HVSP means High Voltage Serial Programming 12V protocol, ISP means In-System Programmable protocol, uses SPI to program the internal flash. TPI is Tiny Programming Interface. dW means debugWIRE protocol. UPDI means Unified Program and Debug Interface protocol (newest).[85]
    Abbreviations
    • TWI: Many of Atmels microcontrollers contain built-in support for interfacing to a two-wire bus, called Two-Wire Interface. This is essentially the same thing as the I²C interface by Philips, but that term is avoided in Atmel's documentation due to trademark issues.
    • USI: Universal Serial Interface (not to be confused with USB). The USI is a multi-purpose hardware communication module. With appropriate software support, it can be used to implement an SPI,[86] I²C[87][88] or UART[89] interface. USART peripherals have more features than USI peripherals.

    2. Timeline

    The following table lists each ATtiny microcontroller by the first release date of each datasheet.

    Year Device (family)
    1999 ATtiny11, ATtiny11L, ATtiny12, ATtiny12L, ATtiny12V, ATtiny22, ATtiny22L
    2002 ATtiny15L, ATtiny26, ATtiny26L, ATtiny28L, ATtiny28V
    2003 ATtiny13, ATtiny13V, ATtiny2313, ATtiny2313V, ATtiny4313
    2005 ATtiny24, ATtiny24V, ATtiny25, ATtiny25V, ATtiny44, ATtiny44V, ATtiny45, ATtiny45V, ATtiny84, ATtiny84V, ATtiny85, ATtiny85V
    2006 ATtiny261, ATtiny461, ATtiny861
    2008 ATtiny13A, ATtiny24A, ATtiny44A, ATtiny48, ATtiny84A, ATtiny88
    2009 ATtiny4, ATtiny5, ATtiny9, ATtiny10, ATtiny43U, ATtiny261A, ATtiny461A, ATtiny861A, ATtiny2313A
    2010 ATtiny20, ATtiny40, ATtiny87, ATtiny167
    2011 ATtiny1634
    2012 ATtiny441, ATtiny841, ATtiny828
    2016 ATtiny102(F), ATtiny104(F), ATtiny417, ATtiny817
    2017 ATtiny212, ATtiny412, ATtiny214, ATtiny414, ATtiny814, ATtiny416, ATtiny816
    2018 ATtiny202, ATtiny402, ATtiny204, ATtiny404, ATtiny804, ATtiny1604, ATtiny406, ATtiny806, ATtiny1606, ATtiny807, ATtiny1607, ATtiny1614, ATtiny1616, ATtiny3216, ATtiny1617, ATtiny3217
    2020 ATtiny1624, ATtiny1626, ATtiny1627
    2021 ATtiny424, ATtiny824, ATtiny426, ATtiny826, ATtiny427, ATtiny827

    3. Development Boards

    The following are ATtiny development boards sold by Microchip Technology:

    • ATtiny104 Xplained Nano
    • ATtiny416 Xplained Nano
    • ATtiny817 AVR Parrot
    • ATtiny817 Xplained Mini
    • ATtiny817 Xplained Pro
    • ATtiny3217 Xplained Pro

    References

    1. 8-bit AVR microcontrollers; Microchip.com http://www.microchip.com/design-centers/8-bit/avr-mcus
    2. timers x waveform generators
    3. AVR compiler options; gcc.gnu.org https://gcc.gnu.org/onlinedocs/gcc/AVR-Options.html
    4. Machine-specific compiler options for the AVR; nongnu.org http://www.nongnu.org/avr-libc/user-manual/using_tools.html
    5. "ATtiny11/ATtiny12 datasheet". Microchip Technology. http://ww1.microchip.com/downloads/en/DeviceDoc/1006S.pdf. Retrieved July 9, 2018. 
    6. "ATtiny15L datasheet". Microchip Technology. http://ww1.microchip.com/downloads/en/DeviceDoc/doc1187.pdf. Retrieved July 9, 2018. 
    7. "ATtiny28 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny28L. Retrieved July 7, 2018. 
    8. "ATtiny22 datasheet". Microchip Technology. http://www.romservice.ru/datashee/Tiny22.pdf. Retrieved July 16, 2018. 
    9. "ATtiny26 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny26. Retrieved July 7, 2018. 
    10. "ATtiny13 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny13. Retrieved July 7, 2018. 
    11. "ATtiny13A webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny13A. Retrieved July 7, 2018. 
    12. "AppNote AVR520 - Migrating from ATtiny13 to ATtiny13A". Microchip Technology. http://ww1.microchip.com/downloads/en/AppNotes/doc8157.pdf. Retrieved July 7, 2018. 
    13. "ATtiny24 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny24. Retrieved July 7, 2018. 
    14. "ATtiny44 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny44. Retrieved July 7, 2018. 
    15. "ATtiny84 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny84. Retrieved July 7, 2018. 
    16. "ATtiny24A webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny24A. Retrieved July 7, 2018. 
    17. "ATtiny44A webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny44A. Retrieved July 7, 2018. 
    18. "ATtiny84A webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny84A. Retrieved July 7, 2018. 
    19. timer0 can use clocks up to the core clock, timer1 can use clocks up to 64MHz
    20. 4 pins are usable, but only 3 unique generators can be attached. The 4th pin would be the inverse of OC1B on the 3rd pin.
    21. Inverted outputs with configured dead zones can be set up for the 64MHz-capable timer1.
    22. "ATtiny25 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny25. Retrieved July 7, 2018. 
    23. "ATtiny45 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny45. Retrieved July 7, 2018. 
    24. "ATtiny85 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny85. Retrieved July 7, 2018. 
    25. "ATtiny43U webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny43U. Retrieved July 7, 2018. 
    26. "ATtiny48 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny48. Retrieved July 9, 2018. 
    27. "ATtiny88 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny88. Retrieved July 9, 2018. 
    28. "ATtiny87 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny87. Retrieved July 9, 2018. 
    29. "ATtiny167 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny167. Retrieved July 9, 2018. 
    30. timer/counter1 is a 10-bit counter that can use clocks to 64MHz.
    31. The PWM channels are based on the 10 bit counter with a maximum of 64MHz clock. Each PWM channel can generate two outputs, normal and inverted, on distinct IO pins. Each pair of outputs can be configured to have a dead-time between their on-states.
    32. "ATtiny261A webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny261A. Retrieved July 9, 2018. 
    33. "ATtiny461 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny461. Retrieved July 9, 2018. 
    34. "ATtiny461A webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny461A. Retrieved July 9, 2018. 
    35. "ATtiny861 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny861. Retrieved July 9, 2018. 
    36. "ATtiny861A webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny861A. Retrieved July 9, 2018. 
    37. "ATtiny441 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny441. Retrieved July 9, 2018. 
    38. "ATtiny841 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny841. Retrieved July 9, 2018. 
    39. "ATtiny828 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny828. Retrieved July 9, 2018. 
    40. "ATtiny1634 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny1634. Retrieved July 9, 2018. 
    41. "ATtiny2313 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny2313. Retrieved July 7, 2018. 
    42. "ATtiny2313A webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny2313A. Retrieved July 7, 2018. 
    43. "ATtiny4313 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny4313. Retrieved July 7, 2018. 
    44. "AppNote AVR533 - Migrating from ATtiny2313 to ATtiny2313A". Microchip Technology. http://ww1.microchip.com/downloads/en/AppNotes/doc8261.pdf. Retrieved July 7, 2018. 
    45. ADC only on ATtiny5/10, and channels are 8 bits instead of 10
    46. "ATtiny4 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny4. Retrieved July 7, 2018. 
    47. "ATtiny5 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny5. Retrieved July 7, 2018. 
    48. "ATtiny9 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny9. Retrieved July 7, 2018. 
    49. "ATtiny10 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny10. Retrieved July 7, 2018. 
    50. "ATtiny20 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny20. Retrieved July 7, 2018. 
    51. "ATtiny40 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny40. Retrieved July 7, 2018. 
    52. "ATtiny102 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny102. Retrieved July 7, 2018. 
    53. "ATtiny104 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny104. Retrieved July 7, 2018. 
    54. "ATtiny202 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny202. Retrieved July 7, 2018. 
    55. "ATtiny402 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny402. Retrieved July 7, 2018. 
    56. "ATtiny204 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny204. Retrieved July 7, 2018. 
    57. "ATtiny404 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny404. Retrieved July 7, 2018. 
    58. "ATtiny804 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny804. Retrieved July 7, 2018. 
    59. "ATtiny1604 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny1604. Retrieved July 7, 2018. 
    60. "ATtiny406 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny406. Retrieved July 7, 2018. 
    61. "ATtiny806 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny806. Retrieved July 7, 2018. 
    62. "ATtiny1606 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny1606. Retrieved July 7, 2018. 
    63. "ATtiny807 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny807. Retrieved July 7, 2018. 
    64. "ATtiny1607 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny1607. Retrieved July 7, 2018. 
    65. "ATtiny212 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny212. Retrieved July 7, 2018. 
    66. "ATtiny412 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny412. Retrieved July 7, 2018. 
    67. "ATtiny214 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny214. Retrieved July 7, 2018. 
    68. "ATtiny414 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny414. Retrieved July 7, 2018. 
    69. "ATtiny814 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny814. Retrieved July 7, 2018. 
    70. "ATtiny1614 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny1614. Retrieved July 7, 2018. 
    71. "ATtiny416 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny416. Retrieved July 7, 2018. 
    72. "ATtiny816 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny816. Retrieved July 7, 2018. 
    73. "ATtiny1616 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny1616. Retrieved July 7, 2018. 
    74. "ATtiny3216 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny3216. Retrieved July 7, 2018. 
    75. "ATtiny417 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny417. Retrieved July 7, 2018. 
    76. "ATtiny817 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny817. Retrieved July 7, 2018. 
    77. "ATtiny1617 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny1617. Retrieved July 7, 2018. 
    78. "ATtiny3217 webpage". Microchip Technology. https://www.microchip.com/wwwproducts/en/ATtiny3217. Retrieved July 7, 2018. 
    79. ATtiny1624; Microchip. https://www.microchip.com/wwwproducts/en/ATTINY1624
    80. "ATTINY3224 - 8-bit Microcontrollers". https://www.microchip.com/wwwproducts/en/ATTINY3224. 
    81. ATtiny1626; Microchip. https://www.microchip.com/wwwproducts/en/ATTINY1626
    82. "ATTINY3226 - 8-bit Microcontrollers". https://www.microchip.com/wwwproducts/en/ATTINY3226. 
    83. ATtiny1627; Microchip. https://www.microchip.com/wwwproducts/en/ATTINY1627
    84. "ATTINY3227 - 8-bit Microcontrollers". https://www.microchip.com/wwwproducts/en/ATTINY3227. 
    85. Atmel Studio Release Notes; Microchip.com http://studio.download.atmel.com/7.0.1931/as-installer-7.0.1931-readme.pdf
    86. "AVR319: Using the USI module for SPI communication" (PDF). Atmel. 2004. http://www.atmel.com/images/doc2582.pdf. Retrieved 10 June 2014. 
    87. "Atmel AVR310: Using the USI Module as a I2C Master" (PDF). Atmel. 2013. http://www.atmel.com/images/atmel-2561-using-the-usi-module-as-a-i2c-master_ap-note_avr310.pdf. Retrieved 10 June 2014. 
    88. "AVR312: Using the USI module as a I2C slave" (PDF). Atmel. 2005. http://www.atmel.com/Images/doc2560.pdf. Retrieved 10 June 2014. 
    89. "AVR307: Half Duplex UART Using the USI Module" (PDF). Atmel. 2003. http://www.atmel.com/Images/doc4300.pdf. Retrieved 10 June 2014. 
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      Handwiki . ATtiny Microcontroller Comparison Chart. Encyclopedia. Available at: https://encyclopedia.pub/entry/32680. Accessed December 01, 2022.
      Handwiki, . "ATtiny Microcontroller Comparison Chart," Encyclopedia, https://encyclopedia.pub/entry/32680 (accessed December 01, 2022).
      Handwiki,  (2022, November 03). ATtiny Microcontroller Comparison Chart. In Encyclopedia. https://encyclopedia.pub/entry/32680
      Handwiki, . ''ATtiny Microcontroller Comparison Chart.'' Encyclopedia. Web. 03 November, 2022.
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