User`s guide

Hardware

4.2 DEBUG FUNCTIONAL OVERVIEW

The block diagram shown in illustrates the debugging/programming operation of the

starter kit.

FIGURE 4-3: STARTER KIT DEBUG BLOCK DIAGRAM

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.

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 5 volt unregulated supply

is regulated by a Microchip MC1727 3.3 volt 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

dsPIC33FJ256GP506 by controlling the target’s MCLR

, 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.

PIC18F67J50 Device

Status

LEDs

dsPIC33F

Device

USB Mini-B

Jack

Serial EEPROM

25LC010A

3.3V LDO

Regulator

12 MHz

Crystal

SPI

ICSP™