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 2008-12-01T23:09:27-08:00 contact@nospam.com hourly 1 2000-01-01T12:00+00:00 http://www.8051projects.net/forum-t10397.html 2008-12-01T23:09:27-08:00 Hi everyone, I'm new on RTX51-full. When using RTX51-full, it need huge of xdata and code. Q1: I'm using the mcu(c52) which is no xdata available. Is it still able to use RTX51? Q2: currently i have using 62256 SRAM. Normaly i'm using XBYTE[] to transfer the data. but the RTX51 itself need xdata and code. What can i do? Q3: How can i do? Is it i have to do some setting on keil compiler? Thank you. http://www.8051projects.net/forum-t10397.html 2008-12-01T23:09:27-08:00 Help Hi,Q1: use "small memory model" for my project mean i have to use idata or data. Normaly AT89C52 only use idata and data. This C52 doesn't support xdata.Q2: i still not understand the A2. I'm using AT89C52, it don't have xram. Is it still can use xdata keyword on my coding? If this the case the AT89C52 can't use xdata do we still can using RTX?Q3: Do you mean the "Off-chip Code memory" and "Off-chip Xdata memory" setting on Target tab? most of the time i didn't set the Eprom and Ram. Actually how to do the setting on there if i plan to use RTX51-Full on my code? Why we need to decide the memory? Please can you guide me...Thank you.I found some information about the space required for RTX51-Full.http://www.iee.put.poznan.pl/zaklady/zneie/materialy/brock/8051/rtx51.pdfCODE = 6-8 Kbytes DATA = 40-46 BytesStack (IDATA) = 20-200 BytesXDATA = 650 Bytes minIs it AT89C52 possible to use RTX51-Full? http://www.8051projects.net/forum-t10397.html 2008-12-01T23:09:27-08:00 Ajay A1: use small memory model for your project.A2: try not to use absolute addressing and accessing of memory when using RTX. instead use xdata keyword to store your variables in xrame.g.CODE:unsigned char xdata x;
 A3: Just go through the target settings once.. you will get your answer. http://www.8051projects.net/forum-t10397.html 2008-12-01T23:09:27-08:00 Ajay It would be better if you use RTX51 Tiny, here are the specifications of rtx tiny:Maximum Number of Defined Tasks: 16 Maximum Number of Active Tasks: 16 Required CODE Space: 900 Bytes Max Required DATA Space: 7 Bytes Required STACK Space: 3 Bytes/Task Required XDATA Space: 0 Bytes Timer: 0 System Clock Divisor: 1,000-65,535 Interrupt Latency: 20 Cycles or Less Context Switch Time: 100-700 Cycles http://www.8051projects.net/forum-t10397.html 2008-12-01T23:09:27-08:00 Help Hi fren..Thank for ur advice...i wil try to use tiny..