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3-1
HARDWARE OVERVIEW
3
CHAPTER 3
HARDWARE OVERVIEW
The evaluation board comes with a 16 MHz 80L186 EB or EC processor, 512 Kbytes of Flash
(containing the iRISM-186 monitor and a Flash loader utility in the boot block), and 256 Kbytes
of SRAM. The expansion connector (JP1) supports up to 1 Mbyte of external memory and
64 Kbytes of external I/O. Refer to Figures 2-1 and 2-2 for the exact locations of connectors,
jumpers and headers listed in this chapter.
The board utilizes the high peripheral integration of the 186 product family. The programmable
chip-selects support on-board memory, expansion memory, and the LCD interface. The
timer/counter unit controls timing for LCD display accesses. The serial control unit communi-
cates with the host PC through the iECM-86 software and the Flash loader host software. Finally,
the I/O port unit controls on-board power management functions (enable/disable serial drivers
and +12 volts).
Other on-chip peripherals are made available for hardware expansion via the JP1, JP2, and P2
connectors. The following sections describe in detail the specific devices used on the board.
3.1 JUMPER SUMMARY
Table 3-1. 80x186EB/EC Evaluation Board Jumper Settings
Jumper Name Description Options
E1 5 V/3 V Select Selects voltage (5 V or 3.3 V) that
will be present on V
CC
power plane.
A-B = 3.3 V
†
B-C = 5 V
E2 LA19/WRT PROT Selects options for Flash WP# pin.
Includes option to make LA19
available to Flash pin 2 for upgrading
to 8-MBIT component
(PA28F800BV).
A-B = Write protect boot block
†
B-C = Unlock boot block
B-D = Add LA19 for 8- MBIT
Flash
E3 V
PP
Select Selects 5 V or 12 V programming
voltage, as well as GND to remove
all program and erase capabilities.
A-B = Total WRT protect
†
B-C = 12 V program voltage
B-D = 5 V program voltage
E4 Flash Powerdown
Select
Selects options for Flash RP# pin.
For normal operation, SW-RES# is
selected. To unlock boot block
(regardless of WP#), 12 V is
selected.
A-B = Normal
†
B-C = Program boot block
override
E5 186/188 Select Jumper for appropriate processor
type.
A-B = 188 processor installed
B-C = 186 processor installed
†
†
Default setting