We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.
Hi, I am trying to implement serial communication from my real time hardware system. I have developed my source code KEIL and verified using serial software simulator of KEIL. I am getting perfect result. But when I am trying to implement on the real time hardware system I am unable to get the desired result. I am using the real time hardware system with a baud rate of 2400bps. Can anyone please explain what could be the possible reason.
regards. raghun
Hello Andy or whoever you are!!!!
You can not make exact 9600 Baud with a 24MHz crystal, the Baudrate wouldn't be exact. The architekture of 8051-UART don't allow this.
If you believe, that you have managed this task, then your wellcome to post your code.
"You can not make exact 9600 Baud with a 24MHz crystal, the Baudrate wouldn't be exact."
Not exact, but close enough (+0.16% error).
PCON |= 0x80; // Set double-rate bit, SMOD TMOD &= 0x0F; // Clear Timer 1 control bits, upper nibble, in TMOD register TMOD |= 0x20; // Put Timer 1 in 8-bit, auto-reload mode (Timer 1, Mode 2) TH1 = 0xf3; // Define Timer 1 reload value RCLK = 0; // Define Timer 1 as the UART receiver baud clock (T2CON.5) TCLK = 0; // Define Timer 1 as the UART transmitter baud clock (T2CON.4) TR1 = 1; // Enable Timer 1 as baud-rate generator (TCON.6)
Check it out at: http://www.keil.com/c51/baudrate.asp