4. The MSP430F1612 microcontroller (Texas Instruments, USA)
was chosen after a benchmark comparing characteristics
between several devices. It has three different power consumption
modes, an internal memory of 55 Kbytes flash and 5 Kbytes
RAM and the possibility to be supplied by two different voltages
in both digital and analog part. An external Electrically-Erasable
Programmable Read-Only Memory (EEPROM) memory was also
incorporated to the tag.