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Hi all, I have written a program in VC++ to write a char array of 13 bytes on COM port using 9600-N-8-1 parameters. when i send this to my target device it responds, but same program when i send through 89S51 my device does not respond.To set 9600-N-8-1 i have written 0xFD value. Can anyone no the reason for such strange behaviour. Please let me know.... rutu.
According to Keil's baudrate calculator you can't do 9600 baud with timer 1 at 12MHz. While, you, indeed, can do it relatively precise with timer 2 - Why, Oh Why, does so many use these silly non-UART frequencies for their crystals? I honestly believe that 11.0592 is the most sold frequency, so it can not be a matter of avialability. If the original poster has taken a glance at Atmels s51 appnotes re UART, he would have seen that all specify 11.0592 crystal. Oh well, it is probably too much to ask that someone that is too lazy to spell the words out and instead writes stupid SMS would read something. Erik
"If the original poster has taken a glance at Atmels s51 appnotes" Maybe he can only understand SMS?
Hi, I checked the baudrate calculater and accordingly configured also i replaced the crystal with 11.0592, even then i m not getting the rs232 communication at 9600. I tried activating the SMOD, even then no use. Have anyone faced similar problem. Rutu
Earlier in this thread you said: "I have checked with Hyperterminal it is ok.I get the data on hyperterminal. When i send data from computer using VC++ prog. the microshows it correctly.But i can't read from micro. using same VC++ prog. to read. what might be the problem ?" Summarising this we get: 1) Hyperterminal to 8051 ok 2) 8051 to hyperterminal ok 3) VC to 8051 ok 4) 8051 to VC NOT ok Which pretty much indicates the problem is with your VC program.
may be vc receiver is not ok ? jane