8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes : Forum / topic http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2008 Rickey's World contact@nospam.com (Ajay Bhargav) contact@nospam.com (Ajay Bhargav) Thu, 08 Jan 2009 22:59:50 -0800 Thu, 08 Jan 2009 22:59:50 -0800 http://backend.userland.com/rss e107 (http://e107.org) 60 Search Search 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes query http://www.8051projects.net/search.php 8051 serial port http://www.8051projects.net/forum-t11188.html
8051 TX -> MAX232 T1in.... MAX232 T1out -> PC RX

=====

9600 baud. 11.0592 MHz. 8 bits. 1 stopbit. No parity.
CODE:

clr sm0
setb sm1
MOV TMOD, #20H
MOV TH1, #253
MOV A, PCON            
clr ACC.7              
MOV PCON, A     
mov SCON, #50H ;8b, 1stop, 1start, REN enabled
GAIN: mov SBUF, #'A' ;letter A is transmitted
HERE: jnb TI, HERE
clr TI
sjmp GAIN
end

Thanks]]> Mon, 28 Jul 2008 14:47:25 -0700 http://www.8051projects.net/forum-t11188.html Re: 8051 serial port http://www.8051projects.net/forum-t11188.html Hi Mac,

the max232 connection seems to be correct, the code doesn't work bcoz you haven't started the timer1, here's the modified code:


CODE:
MOV TMOD, #20H
MOV TH1, #253
ANL PCON,#7FH  
MOV SCON, #50H ;8b, 1stop, 1start, REN enabled
SETB TR1

GAIN: MOV SBUF, #'A' ;letter A is transmitted
HERE: jnb TI, HERE
clr TI
sjmp GAIN
end


all the best !


Arun]]> contact@nospam.com (Ajay Bhargav) Mon, 28 Jul 2008 19:32:31 -0700 http://www.8051projects.net/forum-t11188.html Re: 8051 serial port http://www.8051projects.net/forum-t11188.html In the code you've forgotten to start the timer (setb TR1).
Some lines are superfluous...since you've already set SCON to 50H there's no need to explicitly clr and set smo and sm1.
On reset,the PCON D7 bit is cleared automatically,so you can do away with those 3 lines as well.

EDIT : Seems Arun and I posted at the same time..]]> contact@nospam.com (Ajay Bhargav) Mon, 28 Jul 2008 19:32:34 -0700 http://www.8051projects.net/forum-t11188.html Re: 8051 serial port http://www.8051projects.net/forum-t11188.html contact@nospam.com (Ajay Bhargav) Mon, 28 Jul 2008 20:54:51 -0700 http://www.8051projects.net/forum-t11188.html Re: 8051 serial port http://www.8051projects.net/forum-t11188.html
CODE:

MOV TMOD, #20H
MOV TH1, #244 ;2400
ANL PCON,#7FH  
MOV SCON, #50H ;8b, 1stop, 1start,
SETB TR1

send:
MOV SBUF, #'A' ;letter A is transmitted
jnb TI, $
clr TI
jmp send
end

CODE:

MOV TMOD, #20H
MOV TH1,  #244  ;2400
ANL PCON, #7FH  
MOV SCON, #50H ;8b, 1stop, 1start, REN enabled
SETB TR1

setb p1.7
start:
JNB RI, $ ; wait for an entire byte to be received
CLR RI ; the receive interrupt flag is set by hardware but must be cleared by software
MOV A, SBUF;
CJNE A, #'A', start
clr p1.7
jmp $
end
 

]]> contact@nospam.com (Ajay Bhargav) Sun, 03 Aug 2008 10:49:57 -0700 http://www.8051projects.net/forum-t11188.html Re: 8051 serial port http://www.8051projects.net/forum-t11188.html contact@nospam.com (Ajay Bhargav) Sun, 03 Aug 2008 20:45:34 -0700 http://www.8051projects.net/forum-t11188.html Re: 8051 serial port http://www.8051projects.net/forum-t11188.html ]]> contact@nospam.com (Ajay Bhargav) Mon, 04 Aug 2008 07:18:21 -0700 http://www.8051projects.net/forum-t11188.html