ATtiny24/44/84 Port B also serves the functions of various special. Serial interface, by a. Typical values contained in this datasheet are based on simulations. The on-chip ISP flash allows the program memory to be re-programmed in-system through an SPI serial interface, by a conventional non-volatile memory programmer or by an on-chip boot code running on the AVR core. The Atmel ATtiny24/44/84 AVR is supported with a full suite of program and system development tools. In the Arduino Software click the button in the upper right to open the Serial Monitor. Make sure that your big arduino device was recognized under 'Tools>Serial Port' Now you should be able to see what your ATTINY is saying! This is a great tool for debugging, or if you need to send commands to some other program like a. Use the Serial Monitor in the Arduino IDE with your ATtiny.
![Attiny85 serial port Attiny85 serial port](https://skyduino.files.wordpress.com/2012/11/p1050881.jpg)
Attiny Serial Port Programmer
![Attiny85 Attiny85](http://blog.thegaragelab.com/content/images/galleries/microboard/breakout_tiny_3.png)
Used for communication between the Arduino board and a computer or other devices. All Arduino boards have at least one serial port (also known as a UART or USART): Serial. It communicates on digital pins 0 (RX) and 1 (TX) as well as with the computer via USB. Thus, if you use these functions, you cannot also use pins 0 and 1 for digital input or output.
You can use the Arduino environment’s built-in serial monitor to communicate with an Arduino board. Click the serial monitor button in the toolbar and select the same baud rate used in the call to begin(). The Arduino Mega has three additional serial ports: Serial1 on pins 19 (RX) and 18 (TX), Serial2 on pins 17 (RX) and 16 (TX), Serial3 on pins 15 (RX) and 14 (TX).
Attiny Usb Serial Port
To use these pins to communicate with your personal computer, you will need an additional USB-to-serial adaptor, as they are not connected to the Mega’s USB-to-serial adaptor. To use them to communicate with an external TTL serial device, connect the TX pin to your device’s RX pin, the RX to your device’s TX pin, and the ground of your Mega to your device’s ground.