Glossary

SPI
  • Serial Peripheral Interface
  • The Serial Peripheral Interface (SPI) allows a synchronous high-speed data transfer between the ATmega644P and peripheral devices or between several AVR devices. USART can also be used in Master SPI mode
USART / UART
  • the Universal Synchronous and Asynchronous serial Receiver and Transmitter (USART) is a highly flexible serial communication device.
ADC - Analog-to-digital Converter
  • The ADC converts an analog input voltage to a 10-bit digital value through successive approximation.
JTAG
  • JTAG stands for IEEE 1149.1 standard that was developed by the Joint Test Action Group. With the JTAG-protocol the programming, debugging and testing of processors and FPGAs (Field Programmable Gate Array) is directly realisable in the circuit.
XMLHttpRequest-Object
  • API for the data transfer with the HTTP protocol
  • the use of different query methods (GET, POST, HEAD, PUT)
  • basic module of the AJAX-technique to retrieve data dynamically without loading the web site again
HTTP - Hypertext Transfer Protocol
  • protocol for the transfer of data over a network
  • basically web sites are the main focus