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ATtiny microcontroller comparison chart
Subfamily of 8-bit AVR microcontrollers

ATtiny (also known as TinyAVR) is 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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Features

ATtiny microcontrollers specifically exclude 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)2Maxclock(MHz)Flash(KiB)SRAM(bytes)EEPROM(bytes)USART (UART)I²C(TWI)SPITimers 16/12/8(bits)ADC pinsGPIO pinsIC PackagesGCC arch ID 3PgmDbgRefs
ATtiny11, ATtiny11L6, 21NoNoNoNoNo0 / 0 / 1No5DIP-8N, SO200-8avr1HVSP4
ATtiny12, ATtiny12L, ATtiny12V8, 1.21No64NoNoNo0 / 0 / 1No5DIP-8N, SO200-8avr1ISP, HVSP5
ATtiny15L1.61No64NoNoNo0 / 0 / 246DIP-8N, SO200-8avr1ISP, HVSP6
ATtiny28L, ATtiny28V4, 1.22NoNoNoNoNo0 / 0 / 1No11DIP-28N, TQFP-32, QFN-32avr1HVPP7
ATtiny22, ATtiny22L8, 42128128NoNoNo0 / 0 / 1No5DIP-8N, SO200-8avr2ISP, HVSP8
ATtiny26, ATtiny26L16, 82128128USI*master, slave*master, slave*0 / 0 / 21116DIP-20N, SO300-20, QFN-32avr2ISP, HVPP9
ATtiny13, ATtiny13V, ATtiny13A20, 1016464NoNoNo0 / 0 / 146DIP-8N, SO150-8, SO209-8, VQFN-10, WQFN-20avr25ISP, dW, HVSP101112
ATtiny24, ATtiny24V, ATtiny24A, ATtiny44, ATtiny44V, ATtiny44A, ATtiny84, ATtiny84V, ATtiny84A20, 102, 4, 8128, 256, 512128, 256, 512USI*master, slave*master, slave*1 / 0 / 1812DIP-14N, SO150-14, QFN-20, VQFN-20, UFBGA-15avr25ISP, dW, HVSP131415161718
ATtiny25, ATtiny25V, ATtiny45, ATtiny45V, ATtiny85, ATtiny85V20, 102, 4, 8128, 256, 512128, 256, 512USI*master, slave*master, slave*0 / 0 / 21946DIP-8N, SO208-8, TSSOP-8, QFN-20avr25ISP, dW, HVSP202122
ATtiny43U238425664USI*master, slave*master, slave*0 / 0 / 2416SO300-20, QFN-20avr25ISP, dW, HVPP24
ATtiny48, ATtiny88124, 8256, 51264Nomaster, slavemaster, slave1 / 0 / 1624DIP-28N, QFN-28avr25ISP, dW, HVPP2526
Nomaster, slavemaster, slave1 / 0 / 1828TQFP-32, QFN-32, UFBGA-32
ATtiny87, ATtiny167168, 16512512USI*, UART*Nomaster, slave1 / 0 / 11116SO300-20, TSSOP-20, VQFN-32avr25, avr35ISP, dW, HVPP2728
ATtiny261, ATtiny261A, ATtiny461, ATtiny461A, ATtiny861, ATtiny861A202, 4, 8128, 256, 512128, 256, 512USI*master, slave*master, slave*1 / 0 / 1291116DIP-20N, SO300-20, TSSOP-20, QFN-32avr25ISP, dW, HVPP3031323334
ATtiny441, ATtiny841164, 8256, 512256, 5122 USART*slavemaster, slave2 / 0 / 11212SO150-14, QFN-20, VQFN-20avr25ISP, dW, HVSP3536
ATtiny828208512256USART*slavemaster, slave1 / 0 / 12828TQFP-32, QFN-32avr25ISP, dW, HVPP37
ATtiny163412161024256USI*, 2 USART*slavemaster*1 / 0 / 11218SO300-20, QFN-20avr35ISP, dW, HVPP38
ATtiny2313, ATtiny2313V, ATtiny2313A, ATtiny4313202, 4128, 256128, 256USI*, USART*master, slave*master, slave*1 / 0 / 1No18DIP-20N, SO300-20, VQFN-20avr25ISP, dW, HVPP39404142
ATtiny4, ATtiny5, ATtiny9, ATtiny10120.5 / 132NoNoNoNo1 / 0 / 04 434SOT23-6, UDFN-8avrtinyTPI44454647
ATtiny20122128NoNoslavemaster, slave1 / 0 / 1812SO150-14, TSSOP-14, VQFN-20, UFBGA-15, WLCSP-12avrtinyTPI48
ATtiny40124256NoNoslavemaster, slave1 / 0 / 11218SO300-20, TSSOP-20, VQFN-20avrtinyTPI49
ATtiny102(F)12132NoUSART*Nomaster*1 / 0 / 056SO150-8, UDFN-8avrtinyTPI50
ATtiny104(F)12132NoUSART*Nomaster*1 / 0 / 0912SO150-14avrtinyTPI51
ATtiny202, ATtiny402(0-series)202, 4128, 25664, 128USART*master, slavemaster, slave2 / 0 / 0/ RTT66SO150-8avrxmega3UPDI5253
ATtiny204, ATtiny404, ATtiny804, ATtiny1604(0-series)202, 4, 8, 16128, 256, 512, 102464, 128, 256USART*master, slavemaster, slave2 / 0 / 0/ RTT1012SO150-14avrxmega3UPDI54555657
ATtiny406, ATtiny806, ATtiny1606(0-series)204, 8, 16256, 512, 1024128, 256USART*master, slavemaster, slave2 / 0 / 0/ RTT1218SO300-20, VQFN-20avrxmega3UPDI585960
ATtiny807, ATtiny1607(0-series)208, 16512, 1024128, 256USART*master, slavemaster, slave2 / 0 / 0/ RTT1222VQFN-24avrxmega3UPDI6162
ATtiny212, ATtiny412(1-series)202, 4128, 25664, 128USART*master, slavemaster, slave2 / 1 / 0/ RTT66SO150-8avrxmega3UPDI6364
ATtiny214, ATtiny414, ATtiny814, ATtiny1614(1-series)202, 4, 8, 16128, 256, 512, 204864, 128, 256USART*master, slavemaster, slave2 / 1 / 0/ RTT1012SO150-14avrxmega3UPDI65666768
ATtiny416, ATtiny816, ATtiny1616, ATtiny3216(1-series)204, 8, 16, 32256, 512, 2048128, 256USART*master, slavemaster, slave2or3 / 1 / 0/ RTT1218SO300-20, QFN-20, VQFN-20avrxmega3UPDI69707172
ATtiny417, ATtiny817, ATtiny1617, ATtiny3217(1-series)204, 8, 16, 32256, 512, 2048128, 256USART*master, slavemaster, slave2 / 1 / 0/ RTT1222VQFN-24, QFN-24avrxmega3UPDI73747576
ATtiny424, ATtiny824, ATtiny1624, ATtiny3224(2-series)204, 8, 16, 32512, 1024, 2048, 3072128, 128, 256, 2562 USART*yesyes3 / 0 / 0/ RTT912SO-14, TSSOP-14avrxmega3UPDI7778
ATtiny426, ATtiny826, ATtiny1626, ATtiny3226(2-series)204, 8, 16, 32512, 1024, 2048, 3072128, 128, 256, 2562 USART*yesyes3 / 0 / 0/ RTT1518SO-20, SSTOP-20, VQFN-20avrxmega3UPDI7980
ATtiny427, ATtiny827, ATtiny1627, ATtiny3227(2-series)204, 8, 16, 32512, 1024, 2048, 3072128, 128, 256, 2562 USART*yesyes3 / 0 / 0/ RTT1522VQFN-24avrxmega3UPDI8182
Device (family)Max clock(MHz)Flash(KiB)SRAM(bytes)EEPROM(bytes)USART (UART)I²C(TWI)SPITimers 16/12/8/R(bits)ADC pinsGPIO pinsIC PackagesGCC arch IDPgmDbgRefs
Notes
  • 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 - more recent families have wider timers and may allow chaining two 16-bit timers to do 32-bit capture. RTT is a 16-bit Real Time Timer that is driven by a 32.768KHz clock, though Microchip calls it RTC for Real Time Counter (easily confused to mean Real Time Clock).
  • ADC pins column - the total number of analog channels that are accessible via pins that 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).83
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,84 I²C8586 or UART87 interface. USART peripherals have more features than USI peripherals.

Timeline

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

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

Development boards

The following are ATtiny development boards sold by Microchip Technology:

  • ATtiny104 Xplained Nano88
  • ATtiny416 Xplained Nano89
  • ATtiny817 AVR Parrot90
  • ATtiny817 Xplained Mini91
  • ATtiny817 Xplained Pro92
  • ATtiny3217 Xplained Pro93

See also

  • Electronics portal

Further reading

ATtiny
  • tinyAVR Microcontroller Projects for the Evil Genius; 1st Ed; Dhananjay Gadre, Nehul Malhotra; McGraw-Hill/TAB; 272 pages; 2011; ISBN 978-0071744546.
AVR
  • AVR Programming: Learning to Write Software for Hardware; 1st Ed; Elliot Williams; Maker Media; 474 pages; 2014; ISBN 978-1449355784
  • Some Assembly Required: Assembly Language Programming with the AVR Microcontroller; 1st Ed; Timothy Margush; CRC Press; 643 pages; 2011; ISBN 978-1439820643
  • AVR Microcontroller and Embedded Systems: Using Assembly and C; 1st Ed; Muhammad Ali Mazidi, Sarmad Naimi, Sepehr Naimi; Pearson; 792 pages; 2010; ISBN 978-0138003319.
Wikimedia Commons has media related to TinyAVR.

References

  1. "Atmel Product Guide September 1999" (PDF). Atmel. September 1999. Archived (PDF) from the original on October 6, 2018. Retrieved October 6, 2018. http://ebook.pldworld.com/_semiconductors/Atmel/Databook%20CDROM/Atmel/acrobat/doc0031.pdf ↩

  2. 8-bit AVR microcontrollers; Microchip.com http://www.microchip.com/design-centers/8-bit/avr-mcus ↩

  3. AVR compiler options; gcc.gnu.org https://gcc.gnu.org/onlinedocs/gcc/AVR-Options.html ↩

  4. "ATtiny11/ATtiny12 datasheet" (PDF). Microchip Technology. Retrieved July 9, 2018. http://ww1.microchip.com/downloads/en/DeviceDoc/1006S.pdf ↩

  5. "ATtiny11/ATtiny12 datasheet" (PDF). Microchip Technology. Retrieved July 9, 2018. http://ww1.microchip.com/downloads/en/DeviceDoc/1006S.pdf ↩

  6. "ATtiny15L datasheet" (PDF). Microchip Technology. Retrieved July 9, 2018. http://ww1.microchip.com/downloads/en/DeviceDoc/doc1187.pdf ↩

  7. "ATtiny28 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny28L ↩

  8. "ATtiny22 datasheet" (PDF). Microchip Technology. Retrieved July 16, 2018. http://www.romservice.ru/datashee/Tiny22.pdf ↩

  9. "ATtiny26 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny26 ↩

  10. "ATtiny13 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny13 ↩

  11. "ATtiny13A webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny13A ↩

  12. "AppNote AVR520 - Migrating from ATtiny13 to ATtiny13A" (PDF). Microchip Technology. Retrieved July 7, 2018. http://ww1.microchip.com/downloads/en/AppNotes/doc8157.pdf ↩

  13. "ATtiny24 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny24 ↩

  14. "ATtiny44 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny44 ↩

  15. "ATtiny84 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny84 ↩

  16. "ATtiny24A webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny24A ↩

  17. "ATtiny44A webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny44A ↩

  18. "ATtiny84A webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny84A ↩

  19. timer0 can use clocks up to the core clock, timer1 can use clocks up to 64MHz ↩

  20. "ATtiny25 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny25 ↩

  21. "ATtiny45 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny45 ↩

  22. "ATtiny85 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny85 ↩

  23. Ultra-low voltage model with integrated boost converter that can be powered with only 0.7 volts. /wiki/Boost_converter ↩

  24. "ATtiny43U webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny43U ↩

  25. "ATtiny48 webpage". Microchip Technology. Retrieved July 9, 2018. https://www.microchip.com/wwwproducts/en/ATtiny48 ↩

  26. "ATtiny88 webpage". Microchip Technology. Retrieved July 9, 2018. https://www.microchip.com/wwwproducts/en/ATtiny88 ↩

  27. "ATtiny87 webpage". Microchip Technology. Retrieved July 9, 2018. https://www.microchip.com/wwwproducts/en/ATtiny87 ↩

  28. "ATtiny167 webpage". Microchip Technology. Retrieved July 9, 2018. https://www.microchip.com/wwwproducts/en/ATtiny167 ↩

  29. timer/counter1 is a 10-bit counter that can use clocks to 64MHz. ↩

  30. "ATtiny261A webpage". Microchip Technology. Retrieved July 9, 2018. https://www.microchip.com/wwwproducts/en/ATtiny261A ↩

  31. "ATtiny461 webpage". Microchip Technology. Retrieved July 9, 2018. https://www.microchip.com/wwwproducts/en/ATtiny461 ↩

  32. "ATtiny461A webpage". Microchip Technology. Retrieved July 9, 2018. https://www.microchip.com/wwwproducts/en/ATtiny461A ↩

  33. "ATtiny861 webpage". Microchip Technology. Retrieved July 9, 2018. https://www.microchip.com/wwwproducts/en/ATtiny861 ↩

  34. "ATtiny861A webpage". Microchip Technology. Retrieved July 9, 2018. https://www.microchip.com/wwwproducts/en/ATtiny861A ↩

  35. "ATtiny441 webpage". Microchip Technology. Retrieved July 9, 2018. https://www.microchip.com/wwwproducts/en/ATtiny441 ↩

  36. "ATtiny841 webpage". Microchip Technology. Retrieved July 9, 2018. https://www.microchip.com/wwwproducts/en/ATtiny841 ↩

  37. "ATtiny828 webpage". Microchip Technology. Retrieved July 9, 2018. https://www.microchip.com/wwwproducts/en/ATtiny828 ↩

  38. "ATtiny1634 webpage". Microchip Technology. Retrieved July 9, 2018. https://www.microchip.com/wwwproducts/en/ATtiny1634 ↩

  39. "ATtiny2313 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny2313 ↩

  40. "ATtiny2313A webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny2313A ↩

  41. "ATtiny4313 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny4313 ↩

  42. "AppNote AVR533 - Migrating from ATtiny2313 to ATtiny2313A" (PDF). Microchip Technology. Retrieved July 7, 2018. http://ww1.microchip.com/downloads/en/AppNotes/doc8261.pdf ↩

  43. ADC only on ATtiny5/10, and channels are 8 bits instead of 10 ↩

  44. "ATtiny4 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny4 ↩

  45. "ATtiny5 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny5 ↩

  46. "ATtiny9 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny9 ↩

  47. "ATtiny10 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny10 ↩

  48. "ATtiny20 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny20 ↩

  49. "ATtiny40 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny40 ↩

  50. "ATtiny102 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny102 ↩

  51. "ATtiny104 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny104 ↩

  52. "ATtiny202 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny202 ↩

  53. "ATtiny402 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny402 ↩

  54. "ATtiny204 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny204 ↩

  55. "ATtiny404 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny404 ↩

  56. "ATtiny804 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny804 ↩

  57. "ATtiny1604 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny1604 ↩

  58. "ATtiny406 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny406 ↩

  59. "ATtiny806 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny806 ↩

  60. "ATtiny1606 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny1606 ↩

  61. "ATtiny807 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny807 ↩

  62. "ATtiny1607 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny1607 ↩

  63. "ATtiny212 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny212 ↩

  64. "ATtiny412 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny412 ↩

  65. "ATtiny214 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny214 ↩

  66. "ATtiny414 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny414 ↩

  67. "ATtiny814 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny814 ↩

  68. "ATtiny1614 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny1614 ↩

  69. "ATtiny416 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny416 ↩

  70. "ATtiny816 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny816 ↩

  71. "ATtiny1616 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny1616 ↩

  72. "ATtiny3216 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny3216 ↩

  73. "ATtiny417 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny417 ↩

  74. "ATtiny817 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny817 ↩

  75. "ATtiny1617 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny1617 ↩

  76. "ATtiny3217 webpage". Microchip Technology. Retrieved July 7, 2018. https://www.microchip.com/wwwproducts/en/ATtiny3217 ↩

  77. ATtiny1624; Microchip. https://www.microchip.com/wwwproducts/en/ATTINY1624 ↩

  78. "ATTINY3224 - 8-bit Microcontrollers". www.microchip.com. Retrieved 2021-06-21. https://www.microchip.com/wwwproducts/en/ATTINY3224 ↩

  79. ATtiny1626; Microchip. https://www.microchip.com/wwwproducts/en/ATTINY1626 ↩

  80. "ATTINY3226 - 8-bit Microcontrollers". www.microchip.com. Retrieved 2021-06-21. https://www.microchip.com/wwwproducts/en/ATTINY3226 ↩

  81. ATtiny1627; Microchip. https://www.microchip.com/wwwproducts/en/ATTINY1627 ↩

  82. "ATTINY3227 - 8-bit Microcontrollers". www.microchip.com. Retrieved 2021-06-21. https://www.microchip.com/wwwproducts/en/ATTINY3227 ↩

  83. Atmel Studio Release Notes; Microchip.com http://studio.download.atmel.com/7.0.1931/as-installer-7.0.1931-readme.pdf ↩

  84. "AVR319: Using the USI module for SPI communication" (PDF). Atmel. 2004. Retrieved 10 June 2014. http://www.atmel.com/images/doc2582.pdf ↩

  85. "Atmel AVR310: Using the USI Module as a I2C Master" (PDF). Atmel. 2013. Retrieved 10 June 2014. http://www.atmel.com/images/atmel-2561-using-the-usi-module-as-a-i2c-master_ap-note_avr310.pdf ↩

  86. "AVR312: Using the USI module as a I2C slave" (PDF). Atmel. 2005. Retrieved 10 June 2014. http://www.atmel.com/Images/doc2560.pdf ↩

  87. "AVR307: Half Duplex UART Using the USI Module" (PDF). Atmel. 2003. Retrieved 10 June 2014. http://www.atmel.com/Images/doc4300.pdf ↩

  88. ATtiny104 Xplained Nano board; Microchip. http://www.microchip.com/Developmenttools/ProductDetails/PartNo/ATTINY104-XNANO ↩

  89. ATtiny416 Xplained Nano board; Microchip. http://www.microchip.com/Developmenttools/ProductDetails/PartNo/ATTINY416-XNANO ↩

  90. ATtiny817 AVR Parrot board; Microchip. http://www.microchip.com/Developmenttools/ProductDetails/PartNo/ATAVRPARROT ↩

  91. ATtiny817 Xplained Mini board; Microchip. http://www.microchip.com/Developmenttools/ProductDetails/PartNo/ATTINY817-XMINI ↩

  92. ATtiny817 Xplained Pro board; Microchip. http://www.microchip.com/Developmenttools/ProductDetails/PartNo/ATTINY817-XPRO ↩

  93. ATtiny3217 Xplained Pro board; Microchip. http://www.microchip.com/developmenttools/ProductDetails/PartNo/ATTINY3217-XPRO ↩