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The CPU -
The XU-i088A uses the V20 CPU. It is a CMOS 16-bit
microprocessor with an 8 bit external data bus, operating at
8MHz speed. The V20 CPU instruction set is a superset of the
Intel 8088 instruction set, allowing it to perform as an 8088.
The memory -
The XU-i088A provides 2 memory sockets on board; the program
memory socket (U12) and the buffer memory socket (U14).
The program memory socket -
The U12 socket will accept an 8, 32 or 56KB ROM. The memory
address is located from XE000H to XFFFFH (8KB) or X8000H to
XFFFFH (32KB) or X2000H to XFFFFH (56KB). It is possible to
use an EEPROM or a nonvolatile SRAM instead of a ROM/EPROM in
the ROM socket. It provides the user a place to save data
permanently even when the power is off. It would also allow
the user to download programs from a PC to the remote
XU-i088A.
The buffer memory socket -
The U14 memory socket can use a 8KB or a 32KB SRAM (or
nonvolatile SRAM). This memory is used as a data buffer for
programming data. The memory address is located from X0000H
to X1FFFH (8KB) or X0000H to X7FFFH (32KB).
The DIP switch -
The XU-i088A has an 8 position on board DIP switch. 3
switches are used to select the memory type, the other 5
switches are reserved for user applications. For example,
they can be assigned as a station number selection for
XU-i088A in a multi-station control system.
The 7-segment LED -
The 7-segment LED is used as a system status indicator. A
user may use it for debugging purposes while designing an
application or simply as a system status indicator.
The watch-dog timer -
The watch-dog timer is the circuit that should be refreshed
periodically. If it is not refreshed, it will automatically
reset the system. This prevents a system from hanging
indefinitely.
Real time clock (RTC) -
A 3287 Real-Time Clock (RTC) is included. The 3287(A) is a
low power microprocessor providing a time of day clock. The
3287(A) also equipped with 114 bytes of general nonvolatile
storage which can be used to store the XU-i088A configuration
and status even the power is turned off. The 3287(A) RTC
module equipped with a 3V Lithium battery, this battery is
used to maintain the 114 byte memory and keep the clock
operating during power off situations. The Lithium battery
will operate the 3287(A) at least 10 years while the power is
off.
8255 digital I/O and XDI expansion -
The XU-i088A features a digital I/O controller - 8255. It has
24 digital I/O lines that are divided into three 8 bit ports.
Each port can be programmed as either input or output. All
digital I/Os are configured as Expansion Data Interface (XDI).
A variety of isolated I/O expansion boards are available.
 | XI-PI08 | 8 Line Photo-coupled Input Expansion Board For XDI Bus
| | XI-IM04-32 | 4 Line 12V-32V AC/DC Input Module Expansion Board For XDI Bus
| | XI-IM04-140 | 4 Line 90V-140V AC/DC Input Module Expansion Board For XDI Bus
| | XI-IM04-280 | 4 Line 180V-280V AC/DC Input Module Expansion Board For XDI Bus
| | XO-RR08 | 8 Line 10VA Reed-Relay Expansion Board For XDI Bus
| | XO-SRA4 | 4 Line 3A/24-280V AC Solid-State-Relay (S.S.R.) Expansion Board For XDI Bus
| | XO-SRD4 | 4 Line 3A/5V-60V DC Solid-State-Relay (S.S.R.) Expansion Board For XDI Bus
| | ST-XD02 | Screw Terminal Board For XDI Bus
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XCI expansion -
The XU-i088A provides a XCI interface which allows a user to
connect to a variety daughter boards including digital I/O
expansion, analog I/O expansion and communication I/F.
| XC-IO96 | 96 Line Digital I/O Expansion Board For XCI Bus (XU-i088/PI-IO48)
| | XC-AD12 | 8 Channel 12 Bit 25us A/D Expansion Board For XCI Bus (XU-i088/PI-IO48)
| | XC-DA12 | 2 Channel 12 Bit D/A 12us Expansion Board For XCI Bus (XU-i088/PI-IO48)
| | XC-2285A | RS-232/422/485 Communication I/F Expansion Board for XCI Bus (XU-i088/PI-IO48)
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