OLIMEX PIC-P18 User Manual

PIC-P18 development board

Users Manual

Rev.A, June 2007

Copyright(c) 2007, OLIMEX Ltd, All rights reserved

INTRODUCTION:

PIC-P18 board is development board which allow you to prototype and
develop code for all Microchip’s PIC microcontrollers with 18 pins.

What you can do with PIC-P18? A lot of stuff let’s see what we have:
PIC-P18 have RS232 connector and driver, so you can interface your

PIC microcontroller to other embedded or PC with RS232. The RS232
driver have 4 lines Tx, Rx, CTS and jumper selectable RTS or DTR.
The pin labeled RX is output and should be connected to PIC UART Tx.
The pin labeled TX is input and should be connected to PIC UART Rx.
Note that MAX232 driver on the socket is 5V device, so if you decide
to run your PIC on 3.3V you should replace it with MAX3232 which
works on 3.3V

The on-board ICSP connector allow you to program the PIC on the
board without pulling it of the socket, by ICSP programmer like PIC­MCP, PIC-MCP-USB, PIC-PG1, PIC-PG2, PIC-PG3, PIC-PG4 or to
program and debug it with PIC-ICD2, PIC-ICD2-POCKET or PIC-ICD2­TINY. IMPORTANT: all programmers provide power supply through

ICSP connector during the programming PIC-P18 should not be
powered via the external power jack!

The power supply circuit have diode bridge after the power supply jack
which allow you to power this board with both AC and DC power supply
adapters. The input voltage could be anything within the range +7.5 –
15V DC or 6-12V AC.

Voltage regulator is made with LM317 adjustable voltage regulator and
have jumper which selects what voltage you supply to the PIC
microcontroller +3.3V or +5V, so you can work with PICs on both low
and normal voltage.

The oscillator circuit is made with 20 Mhz crystal oscillator, so you
can run your PIC at maximum performance.

The RESET circuit is made with simple RC circuit and RESET push
button, the reason to not use RESET IC is that the board should
support both 3.3V and 5V operation while RESET ICs are on fixed
voltage.

PIC-P18 have user button for user input connected to PIC
microcontroller’s RB2 port. When RC2 port is initialized as INPUT you
will read “0” when the button is pressed and “1” when it is depressed.

Status LED is connected via jumper to PIC microcontroller’s RB3 port.
When your RB3 port is initialized as OUTPUT and set to “0” LED will
go ON, when RC2 port is set to “1” LED will go OFF.

PIC-P18 have handy GND pin for connection to oscilloscope.

FEATURES:

• ICSP/ICD connector for programming and debugging

• RS232 interface with MAX232 IC o n socket

• DIL18 microcontroller socket

• Quartz crystal 20Mhz

• LED to RB3 through jumper

• user Button to RB2

• Reset button and circuit

• Power plug-in jack, accept AC and DC input

• selectable +3.3V / +5V power supply voltage regulator (3.3V when jumper is

closed)

• Extension slot on every uC pin

• Gird 100 mils

• GND bus

• Vcc bus

• Four mounting holes 3,3 mm (0,13")

• FR-4, 1.5 mm (0,062"), green soldermask, white silkscreen component print

• Dimensions 100x80 mm (3,9x3,15")

All boards produced by Olimex are ROHS compliant