OLIMEX PIC-P28 Manual de usuario

PIC-P28 development board

Users Manual

All boards produced by Olimex are ROHS compliant

Rev. D, February 2008

Page 1

INTRODUCTION:

PIC-P28 board is development board which allow you to prototype and

develop code for all Microchip’s PIC microcontrollers with 28 pins.

What you can do with PIC-P28? A lot of stuff let’s see what we have:

PIC-P28 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 PIC-

MCP, 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-ICD2-

TINY. 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-P28 have user button for user input connected to PIC

microcontroller’s RA5 port. When RA5 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 RA0 port.

When your RA0 port is initialized as OUTPUT and set to “0” LED will

go ON, when RA0 port is set to “1” LED will go OFF.

PIC-P28 have handy GND pin for connection to oscilloscope.

Page 2

Page 3

FEATURES:

•ICSP/ICD connector for programming and debugging

•RS232 interface with MAX232 IC on socket

•DIL28 microcontroller socket

•Quartz crystal 20Mhz

•LED to RA0 through jumper

•user Button to RA5

•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")

Page 4

SCHEMATIC:

Page 5

4.7uF/25VDC

4.7uF/25VDC 4.7uF/25VDC

4.7uF/25VDC

470uF/16VDC 100uF/16VDC

100n

22p

100n

NA 1N4004

B-DIL

+5V

4-20MHz

330

10K

390/1%

240/1%

330/1%

10k

PIC28pin

MAX232

LM317

3.3V

BUT

C2 C3

C6 C7

C10

C11

C12

CTS

ICSP

LED

LED_J

PWR

RS232

RST

RTS/DTR

INT/RB0 21

MCLR#/THV

OSC1/CLKIN

OSC2/CLKOUT

PGC/RB6 27

PGD/RB7 28

PGM/RB3 24

RA0/AN0

RA1/AN1

RA2/AN2

RA3/AN3

RA4/T0CKI

RA5/AN4

7RB1 22

RB2 23

RB4 25

RB5 26

RC0/T1OSO

RC1/T1OSI

RC2/CCP1

RC3/SCL/SCK

RX/RC7 18

SDI/SDA/RC4 15

SDO/RC5 16

TX/RC6 17

20 8

VDD

VSS

C1+ 1

C1- 3

C2+ 4

C2- 5

R1IN

13 R1OUT 12

R2IN

8R2OUT 9

T1IN 11

T1OUT

T2IN 10

T2OUT

V+

V-

1516

GNDVCC

U2P

ADJ

IN OUT

12-RTS

23-DTR

6VAC

9VDC

PIC-P28

Rev. D

http://www.olimex.com/dev

SOFTWARE:

DEMO1: PIC16F876-I/P BLINK LED

This is demo code which blinks the LED on PIC-P28 board.

Note:

LED jumper should be closed!

DEMO2: PIC16F876-I/P

BUTTON read

This is demo code which show how to read BUTTON status and to switch

the LED ON when button is pressed and LED off when the button is

depressed.

DEMO3: PIC16F876-I/P

RS232 send / receive routines

This is demo code, which show how to use the USART to send and receive

characters from host PC via RS232 cable.

The MAX232 by default is not connected to PIC on the board so you have to

solder two wires – one from RC6 (pin #17) of PIC16F876 Tx signal to

MAX232 Rx labeled pin, and second from RC7 (pin #18) of PIC16F876 Rx

signal to MAX232 Tx labeled pin.

You must program the HEX code to PIC16F876 and run the code.

If you programmed the PIC correctly and wired the UART, when you open

Hyperterminal on your host PC computer with 9600 bps, 8 data bit, 1 stop

bit, No flow control and apply power supply to the PIC-P28 every character

you type on the hyperterminal will be printed back with “*” i.e. if you type

“abc” you will receive “a*b*c*”.

Page 6

ORDER CODE:

PIC-P28 – assembled and tested (no kit, no soldering required)

PIC-P28/PCB – blank PCBs only

How to order?

You can order to us directly or by any of our distributors.

Check our web www.olimex.com/dev for more info.

Revision history:

REV. D - create February 2008

Page 7

Disclaimer:

Olimex Ltd. Other terms and product names may be trademarks of others.

The information in this document is provided in connection with Olimex products. No license, express or implied

or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Olimex

products.

Neither the whole nor any part of the information contained in or the product described in this document may be

adapted or reproduced in any material from except with the prior written permission of the copyright holder.

The product described in this document is subject to continuous development and improvements. All particulars of

the product and its use contained in this document are given by OLIMEX in good faith. However all warranties

implied or expressed including but not limited to implied warranties of merchantability or fitness for purpose are

excluded.

This document is intended only to assist the reader in the use of the product. OLIMEX Ltd. shall not be liable for

any loss or damage arising from the use of any information in this document or any error or omission in such

information or any incorrect use of the product.

Page 8

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