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INTEL 186 EB/EC EVALUATION BOARD USER’S MANUAL
3-2
3.2 MICROPROCESSOR
The core of the evaluation board is the 80x186 microprocessor. This processor operates at
3.3 volts up to 16 MHz in this board. Alternatively, the board can be configured to run at 5 volts
up to 33 MHz. To vary the CPU clock speed, an appropriate frequency value oscillator must be
installed at location U3 on the EC board and at location U5 on the EB board. The oscillator
operates at twice the frequency of the installed processor.
The 80x186 processor offers the following features:
• 16-bit data bus
• 1 Mbyte address space
• 2 on-chip UARTs
• 10 programmable chip-selects
• Interrupt control unit
• 3 programmable timer/counters
• Power management unit
• 32-bit watchdog timer (EC only)
• 4 DMA channels (EC only)
The 8-bit bus version of the processor (80C188/80L188) may also be used in this board. To
configure the board to operate with an 8-bit bus, jumper E5 must be in the A–B position. To
configure the board to operate with a 16-bit bus, jumper E5 must be in the B–C position. Many
of the processor’s on-chip peripherals can be accessed using the two expansion connectors on the
board (JP1 and JP2).
NOTE
Because host communications use the on-chip serial ports, changing the
operating frequency of the board requires the processor serial ports to be
reconfigured. The RISM monitor source code is provided on a floppy diskette
in your kit and is commented to indicate current register values.
3.2.1 Packaging
The 80x186 EC is packaged in a 100 lead PQFP and socket and the 80x186 EB is packaged in an
84 lead PLCC package and socket. Adaptors are available from Applied Microsystems Corp.*
and Emulation Technologies, Inc.* to allow for the connection of in-circuit emulators.