Hi, I was wondering, if there is any possible way to use RS-232 in the attiny13. I was trying to use software uart (program was compiled in BASCOM-Basic), but It was always out of SRAM. Tiny13 has ony 64 bytes of SRAM. Program UART on ATtiny13. I showed an example of software UART for ATtiny13 and thus used the Arduino IDE as a development environment. ATtiny13 is clocked from the internal RC circuit.

Contents • • • • • • • 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. • timers x waveform generators • 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. • 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. Packages in this table are 0.3 inches (7.62 mm) row-to-row.

SOwww means package with a case width of 'www' in. 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,,. • 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 protocol, uses SPI to program the internal flash. TPI is Tiny Programming Interface.

DW means protocol. UPDI means Unified Program and Debug Interface protocol (newest). 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 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 ). The USI is a multi-purpose hardware communication module. With appropriate software support, it can be used to implement an, or interface. It should be noted that USART peripherals have more features than USI peripherals. Timeline [ ] The following table lists each ATtiny microcontroller by the first release date of each datasheet.

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Retrieved July 7, 2018. Retrieved 10 June 2014. Retrieved 10 June 2014. Retrieved 10 June 2014. Retrieved 10 June 2014. Further reading [ ] ATtiny • tinyAVR Microcontroller Projects for the Evil Genius; Dhananjay Gadre and Nehul Malhotra; McGraw-Hill/TAB; 272 pages; 2011;. AVR • AVR Programming: Learning to Write Software for Hardware; Elliot Williams; Maker Media; 474 pages; 2014; • Some Assembly Required: Assembly Language Programming with the AVR Microcontroller; Timothy S Margush; CRC Press; 643 pages; 2011; • AVR Microcontroller and Embedded Systems: Using Assembly and C; Muhammad Ali Mazidi, Sarmad Naimi, Sepehr Naimi; Pearson; 792 pages; 2010;.