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MPLAB ? Starter Kit for PIC24H Microcontrollers User’s Guide
4.2
DEBUG FUNCTIONAL OVERVIEW
The block diagram shown in Figure 4-4 illustrates the debugging/programming
operation of the starter kit.
FIGURE 4-4:
STARTER KIT DEBUG BLOCK DIAGRAM
USB Mini-B
Jack
3.3V LDO
Regulator
12 MHz
Crystal
PIC18F67J50 Device
Serial EEPROM
PIC24H MCU
25LC010A
Device
Status
LEDs
The starter kit, with its built-in debugger/programmer, provides an all-in-one solution for
debugging and programming applications using MPLAB IDE. Also, no additional
external power supply is needed as power is supplied by the host PC’s USB port. See
the schematics in Figure A-7 and Figure A-8.
The starter kit’s debugging/programming operations are controlled by a PIC18F67J50
MCU running at 48 MHz. The PIC18F67J50’s built-in USB engine provides the
communications interface between the starter kit and the host PC.
Power to the starter kit is provided via USB, whose nominal 5V unregulated supply is
regulated by a Microchip MC1727 3.3V low-dropout (LDO) linear regulator. Proper
starter kit main system power is indicated by the green LED, D1.
The PIC18F67J50 MCU accomplishes debugging or programming of the target
PIC24HJ128GP504 by controlling the target’s PGC1/EMUC1 and PGD1/EMUD1
signals. Target power is switched on/off via a low V CE saturation PNP transistor
configured as a high-side switch. Target clocking is also provided by the PIC18F67J50
MCU.
A Microchip 25LC010A serial EEPROM is used to store the starter kit’s serial number
and debug control information.
DS51780A-page 28
? 2008 Microchip Technology Inc.
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