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hi there i am trying to communicate microcontroler with computer.the program is as follow's
#include<reg52.h> void main(void) { TMOD = 0x20; TH1 = 0xF3; SCON = 0x50; TR1 = 1; PCON = 0x80; while(1) { SBUF ='A'; while(TI == 0); TI = 0; } }
at hard ware end i am using max 232cpe controller at89s52 the prog. is runing properly.as tested in keil but not working at the hard ware side i am tested it in hyper terminal with the following setting baud rate 9600 parity bit none stop bit 1 flow controller none but no output please help me
what is your clock speed
I guess you used 24Mhz?
It seems that you programmed it to loop forever but not to transmit A forever, but to transmit A once and do nothing.
Still an A should be transmitted at each reset. Do you receive it?
Are you sure RX/TX/Gnd are connected right for your cable?
How do you know if your max232 circuit is working?
Ed
Yu can connect microcontroller to computer cross connection. computer rx tıo your card tx and computer tx to your cards rx . Yu can test your connection cable. İf you can start hyper terminal and connect your cables rx and tx with an jumper. Then if you press a key in your keyboard you see from yor secreen same charecter. You can use this technic step by step for all rx an tx connection. Last test is 8051 rx and tx pins connect. İf you can recive same charecter all connection is true.
erik malund clock speed 24Mhz
ED Deep i tried it transmit A once but still no result
ali karakas shorting 2 and 3 pin of RS 232 pressed charactor apperes on screen
You can connect to your pc only rs232 cable and then you must make short circuit other side with pin 2 and 3. After open hyper terminal and configure it. All configuration must be true. Select com port from hyper terminal and baud rate and start stop bit and parity bit and follow control. After you can press a character from your keyboard ant you must recive same charecter on your screeen. İf its rigth your connection and your setup for pc side rigth.
Step 2 ) After you can connect rs232 cables another side to your board. And make short circuit from 232 ic tx an rx pin (not for TTL -only 232 level). Rpeat first step.
step 3) After you can connect 8051 rx and tx pin short circuit. After rpeat step1. İf all step is okey .your cable and your board connection its possible. İf you can dont make this proses. İ can send to you a shema for this operation.
thank's for the help problem solved the one silly mistake result in big problem. this is the first step if i struct in any problem in future hope all of you help me
thank's again