Communication 16450 - The XC-2285A acts as a communication link between the XU-i088A and a PC and/or other XU-i088A single board computers. One example is to link the XU-i088A to a PC. This enables the user to monitor and/or control the on board digital I/O of the XU-i088A and other devices on the XCI expansion boards from the PC. If an EEPROM is installed on the ROM socket of the XU-i088A, the user can even download programs from the PC to the XU-i088A via the XC-2285A communication I/F.

Real time clock (RTC) - A 3287A Real-Time Clock (RTC) module is included on the XC-2285A. The 3287A is a low power microprocessor providing a time-of day clock and one hundred years with battery operation. The 3287A also equipped 114 bytes of general nonvolatile storage, they can be used to stored the XU-i088A configuration and status even the power is turn off. The 3287A RTC module equipped with a 3V Lithium battery, this battery is used to stored the 114 byte memory and keep the clock operating during the power off. The Lithium battery will operate the 3287A at least 10 years during the power is off.

Timer - An 8254 timer is included on the XC-2285A. The 8254 is included on the XC-2285A to supplement the XU-i088A. Since the XU-i088A does not have a timer to generate accurate time delays for certain applications, the application may use the 8254 timer on the XC-2285A. This counter/timer chip can be programmed to create accurate time delays. There are several different modes of operation for the 8254. Each has its advantage over the others under certain circumstances.

BEEPer - A beeper is also provides by the XC-2285A. The frequency of the BEEPer is determined by the 8254 Timer 1 OUT or the timer 1 & 2 OUT. If the BEEPer is used, then the Timer 1 & 2 INT should be disabled.