i want to interface rs232 of pc with pic16f877.
in pic side i like to use inbuilt serial ports
how can use the serial ports of pic16f877
give me some examples for initilize pins,configure serial port,baud rate settingsand everything

 

Look at my RS232 tutorial at http://www.winpicprog.co.uk, one of the later ones uses the USART in a 16F876.

 

Do you need to use a MAX232 or equivalent on this PIC?

 

If you want to use the hardware USART you have to have inverters on the input and output (which is what a MAX232 does, and what it's designed to operate with), but if you do software RS232 you can use a simple (crude!) resistor - like the BASIC STAMP does.

 

To set up the 232 in the pic16f877.h add :
#use rs232(baud=9600 ,xmit=PIN_C6,rcv=PIN_C7)

also youll want to define:
#define puts(s) {printf(s); putchar(13); putchar(10);}

#use fixed_io(C_OUTPUTS=PIN_C6)
#byte port_C=7


in the .c code i used: printf(" hello world");
to sent the string to the serial buffer on the p.c. to my v.b program

hope this helps

 

To set up the 232 in the pic16f877.h add :
#use rs232(baud=9600 ,xmit=PIN_C6,rcv=PIN_C7)

also youll want to define:
#define puts(s) {printf(s); putchar(13); putchar(10);}

#use fixed_io(C_OUTPUTS=PIN_C6)
#byte port_C=7


in the .c code i used: printf(" hello world");
to sent the string to the serial buffer on the p.c. to my v.b program

hope this helps

 

I hope this can help you if you still stuck

 

hai any one there , please provide me with a working ckt dig of max232

which can transmit data from a serial port to something(transmitter)

which can receive data from something(receiver) to serial port

__________________
robosat
9884282216(india-chennai)

 

Go to the link above to my tutorials, they give all the hardware details as well - including a MAX232 interface.

 

I need help interfacing max232 to pic16f877. what should i do first and the sample code if you can help me how to initialized it so that i can transmit data between two PIC.

 

For two PICs, one don't need to use MAX232.

If both PICs are on same power supply voltages level, e.g. +5V, and both has hardware USART feature, then just simply connect RX pin of one PIC to the TX pin of another and you are done regarding hardware.

__________________
L.Chung

 

".........."


And can any one help me in software for this my amail id is ali.mir10v@gmail.com

 

I have heard, often, that most PC's do not need level translation. Have not tried it.
You can get the translators in a cable or very small board. There is a short list at:
PC-Microcontroller Communications - Open Circuits