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Processor Module and Device Adapter Specification
4.1.2
EMULATOR PROCESSOR POWER
4.1.4
OPERATING VOLTAGE OF 2.0 TO 4.6
SUPPLIED BY TARGET APPLICATION
SYSTEM
When the MPLAB IDE software is brought up, the
emulator system is first initialized with the emulator
system powering the emulator processor. The
“Processor Power Supplied by Target Board” option
may then be selected using the Power tab of the
Settings dialog ( Debugger>Settings ) to power the
processor module from the target board.
VOLTS
If the target application system’s operating voltage is
between 2.0V and 4.55V (±120 mV), the processor
module will consider this a LOW VOLTAGE condition.
In this mode, the processor is limited to its rated speed
at a given voltage level (as indicated in its data sheet).
To minimize the amount of reverse current that the
target system is exposed to, the recommended
power-up sequence is:
When operating from external power, the processor
module will typically represent a current load equivalent
to the device being emulated (according to its data
sheet) plus approximately 100 mA. Keep in mind that
the target application will affect the overall current load
of the processor module, dependent upon the load
placed upon the processor I/O.
When the processor power is supplied by the target
application system, an external clock (from the target
board) may also be provided. MPLAB IDE will not allow
use of an external clock without the use of external
power.
1.
2.
3.
4.
5.
6.
Apply power to the PC host.
Apply power to the emulator pod and processor
module assembly.
Invoke MPLAB IDE.
Select Debugger > Settings and click the Power
tab. Configure system for “Processor Power
Supplied by Target Board”.
At the error message, apply power to the target
application circuit. Then acknowledge the error.
Issue a System Reset (from the debugger
menu) before proceeding.
4.1.3
OPERATING VOLTAGE OF 4.6 TO 5.5
VOLTS
7.
Select Debugger > Settings and click the Power
tab. Verify that the dialog says “Low Voltage
Enabled.” Click Cancel to close the dialog.
If the target application system’s operating voltage is
between 4.55V (±120 mV) and 5.5V, the processor
4.2
Operating Frequency
module will consider this a STANDARD VOLTAGE
condition. In this mode, the processor can run to its
highest rated speed (as indicated in its data sheet).
The recommended power-up sequence is:
The processor modules will support the maximum
frequency of the device under emulation. The maxi-
mum frequency of a PICmicro MCU device is
significantly lower when the operating voltage is less
1.
2.
3.
Apply power to the PC host.
Apply power to the emulator pod and processor
module assembly.
Invoke MPLAB IDE.
than 4.5V.
The processor modules will support a minimum
frequency of 32 kHz. When operating at low
frequencies, response to the screen may be slow.
4.
Select Debugger > Settings and click the Power
4.3
Clock Options
tab. Configure system for “Processor Power
Supplied by Target Board”.
MPLAB ICE 4000 allows internal and external clocking.
5.
6.
At the error message, apply power to the target
application circuit. Then acknowledge the error.
Issue a System Reset (from the debugger
menu) before proceeding.
When set to internal, the clock is supplied from the
internal programmable clock, located in the emulator
pod. When set to external, the oscillator on the target
application system will be utilized.
4.3.1
CLOCK SOURCE FROM EMULATOR
Refer to the MPLAB ICE 4000 on-line help file in
MPLAB IDE ( Help>Topics ) or the MPLAB ? ICE 4000
User ’s Guide (DS51490), “Using the On-Board Clock”,
for configuring MPLAB IDE to supply the clock source.
? 2005 Microchip Technology Inc.
Preliminary
DS51298E-page 3
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