Hello, I am not able to receive the value of SBUF into a char. The part of code is shown below. Always when I try, the value is 0x00. I will be obliged for helpful commends. SCON = 0x50; char Byte; The code below is in ISR for Serial interrupt if(RI) { Byte = SBUF; RI = 0; } Thanks
Have you set up the simulator so that something is actually being loaded into SBUF before you try to read it?
Yes I tried entering values thru program as SBUF = 0x0f; and also by setting the value in the serial window of the simulator, both on the run and before the start.
"SCON = 0x50;" Did you also initialise all the other relevant SFRs?
Yes I tried entering values thru program as SBUF = 0x0f; SBUF is TWO registers, you can NOT read what you write. Erik Study "the bible" Chapter 1 http://www.semiconductors.philips.com/acrobat/various/80C51_FAM_ARCH_1.pdf chapter 2 http://www.semiconductors.philips.com/acrobat/various/80C51_FAM_PROG_GUIDE_1.pdf chapter 3 http://www.semiconductors.philips.com/acrobat/various/80C51_FAM_HARDWARE_1.pdf Erik