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PICKIT ? 1 FLASH STARTER KIT
USER ’S GUIDE
Appendix A. Hardware Description
A.1
A.2
INTRODUCTION
This appendix contains the PICkit? 1 hardware description and schematic diagrams.
HIGHLIGHTS
This appendix discusses:
?
?
?
?
In-Circuit Serial Programming? (ICSP?)
Programming Hardware
USB Communications Protocol
Schematic Diagrams:
- PICkit 1 Board Diagram
- LED Layout
- V PP Supply
- USB Control
- Prototype 1
- Prototype 2
A.3
A.4
IN-CIRCUIT SERIAL PROGRAMMING? (ICSP?)
In-Circuit Serial Programming (ICSP) allows an engineer to design a circuit that will be
built and then programmed later. ICSP is described in the programming specifications
documentation. These documents can be found on the Microchip web site
(http:\\www.microchip.com). ICSP requires a 12-13V power supply, control of the V DD
supply and two I/O pins to clock in commands and data.
PROGRAMMING HARDWARE
The programmer portion of the PICkit 1 Flash Starter Kit circuit is shown in Figure A-1.
Additional circuitry is present to connect to the USB and drive the evaluation LEDs.
Most of the circuitry in the figure is used to generate the +13V required for V PP . This is
generated by using the CCP of the PIC16C745 to pulse Q2 on and off. By pulsing Q2,
L1 generates a burst of charge that is steered into the capacitor C4 by the diode D13.
Each burst of charge adds to the voltage already in the capacitor. The size of the burst
of charge is proportional to the on time of the PWM signal from CCP. The resistors R10
and R11 form a voltage divider that drops the 13V V PP to a 4.5V feedback signal that
is measured by AN1. Software running in the PIC16C745 periodically samples AN1
and computes a new PWM value. The PWM value is updated just over 500 times every
second. This ensures good voltage regulation of the 13V and leaves enough CPU time
to perform the programming task. The rest of the circuit is used to switch the V PP
voltage to the V PP pin. Transistor Q4 is the switch for the V PP voltage and Q3 is the
driver for Q4. Transistor Q1 turns V DD on and off allowing the target device to be reset.
The programming I/O signals are generated by software routines on I/O port pins RC6
and RC7 of the PIC16C745, which drive I/O port pins RA0/GP0 (ICSPDAT) and
RA1/GP1 (ICSPCLK) of the target 8 or 14-pin Flash device.
? 2004 Microchip Technology Inc.
DS40051D-page 27
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