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PICDEM-1 USER ’S GUIDE
Appendix A. Hardware Detail
The PICDEM-1 hardware is extremely simple and is intended to illustrate the
ease of use of several PICmicro parts. The PICDEM-1 features the following
hardware elements:
A.1
A.2
A.3
Processor Sockets
Although three sockets are provided, only one device may be used at a time.
? 18-pin socket
? 28-pin socket
? 40-pin socket
Display
Eight red LEDs are connected to PORTB of each processor type. The PORTB
pins are set high to light the LEDs.
Power Supply
There are two ways to supply power to PICDEM-1:
? A 9V, 100 mA unregulated AC or DC supply can be plugged into J2.
? A +5V, 100 mA regulated DC supply can be connected to the hooks
provided.
PICMASTER users have a regulated +5V power supply available in the logic
probe connector and can easily connect to the hooks on PICDEM-1 (Red
probe to +5V and Black probe to GND).
Note:
The exact power up sequence listed in Getting Started (Section 2)
of this guide must be followed.
A.4
RS-232 Serial Port
An RS-232 level shifting IC has been provided with all necessary hardware to
support connection of an RS-232 host through the DB9 connector. The port is
configured as DCE, and can be connected to a PC using a straight through
cable.
PIC17C4X devices have their RX and TX pins tied to the RX and TX lines of
the Max232A. The other devices do not have a serial port implemented in
hardware, but an RS-232 interface may be implemented in software using
pins RA2 and RA3.
? 1999 Microchip Technology Inc.
DS33015C-page 45
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