Develop applications using the AVR 1-series ATtiny814
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Summary ATtiny814 breakout New UPDI+ programming header Status LED Reset button What is it? This board holds an AVR ATtiny814 microcontroller, providing access to all of the IO pins. It adds power …
Read More…This board holds an AVR ATtiny814 microcontroller, providing access to all of the IO pins. It adds power supply decoupling capacitors, an LED, a button, and UPDI programming header to make a convenient self-contained development board for small microcontroller projects.
The LED is attached to the PA7
pin via a 2k2 current-limiting resistor.
The button is attached to the PA0
UPDI/RESET#
pin via a series resistor to prevent damage in case of drive contention. Note that the PA0
pin defaults to UPDI mode. Switching the pin to RESET mode will require the use of a 12V-capable UPDI programmer if you want to program the chip after this.
The board also provides a programming header in the AVR standard 2x3 layout. Note that this will requires a UPDI-capable programmer. An SPI-style ISP programmer will not work with this chip. This programming header also includes the USART.0 TX and RX signals in "UPDI+" layout, allowing single-cable programming and debug with a suitable programmer.
Finally, an extra 2-pin header is provided with another VCC and GND pin in case additional connections are required.
Reference icons are placed next to the pins used by the USART, I²C, SPI, and DAC modules, and where the LED is connected, to remind you what functions those pins usually perform.
This board is supplied with two 7 pin header strips for the IO pins and one 2x3 pin for the programming connector.
The ATtiny814 is one of the new AVR 1-series microcontrollers, containing xmega-style peripherals. These are more powerful and flexible than previous generations of ATmega and ATtiny chips.
This particular chip contains 8 KiB of flash and 512 bytes of RAM on an AVR CPU clocked at 20 MHz. It provides two 16bit and one 12bit PWM-capable timers, a 16bit realtime counter, a USART with fractional baud rate generator, a master/slave capable SPI interface, I²C interface, analog comparator, 10bit ADC, 8bit DAC, and in total 12 IO pins split across two ports. It also provides a 6-channel event system and configurable custom logic block that can route events between peripherals without waking the CPU.
More information can be found on Microchip's website at https://www.microchip.com/wwwproducts/en/ATTINY814
I wanted to experiment with the new AVR 1-series chips, but couldn't find any maker-oriented hardware for them.
I believe this may be the first use of an ATtiny814, outside of the development boards produced by Microchip themselves.
AVR UPDI Programmer with 12V
A USB UPDI programmer with a second serial port and 12V pulse generator
AVR UPDI Programming Cable
Flash firmware onto an AVR microcontroller chip via UPDI
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