Microchip Technology MPLAB ICE, User Manual

Page: 85 / 192

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2001 Microchip Technology Inc. DS51159B-page 85
General Set Up
4.6.2 Processor Power from Target Board
Select the Power tab of the Development Mode dialog. Under Processor
Power, select From Target Board and click Apply.
Refer to the MPLAB ICE Processor Module and Device Adapter Electrical
Specification (DS51140) for processor module power requirements before
configuring the system for target system power.
Figure 4.5: Development Mode Dialog – Power Tab, From Target Board
4.6.3 Low Voltage Emulation
MPLAB ICE also supports LOW VOLTAGE emulation, from 2.0V to 4.6V. The
emulator system cannot provide any voltage level other than 5V to the
emulator processor. In this configuration, power must be supplied by the
target board (see above).
Note: If you use power from the target board, make sure it is always
present or the emulator will not function properly. If the device
adapter is plugged into an unpowered target board, there may still
be some leakage current through V
CC
of the device adapter.
MPLAB may also have difficulty initializing the emulator when
power has not yet been applied to the target board.
Note: Before connecting the emulator system to the target application
system, power on the emulator system (with processor module
already inserted), and select Processor Power from Emulator to
allow MPLAB to perform the initialization. Then, select the Power
from Target Board, connect the target board to the emulator system
and apply power to the target board. This will minimize the target
system exposure to reverse current.