I have a board with an 89S8252, configured with VNM at Address 2000-7FFF, 0000-1FFF is Flash. I have configured Mon51 with install 8 7f 0. I have Set Intvects and Cseg at 2800H. I get the connection with Mon51, it downloads my program and than gets into and endless loop somewhere. Hardware reset on the processor board results in a jump to 2800H, but there it stops instead of going to main. The go command proceeds then normally to main. Whats wrong?
Now, I'm completely stuck. Here is what happens: Hardware is 89S8252 based Board, Int. Flash from 0000-1FFF VNM Memory from 2000-7FFF Monitor in Flash @0000 Changes to Install.A51 only INT-ADR_OFF = 2800 DEF_PC-VAL = 2800 then generated Mon51 with instal 8 7F 0, burned into flash. Disasm shows all Vects but Serial Int are relocated properly to 2800. At 0000 there is a LJMP C:00FE (Initserial), at 0003 a LJMP to C:2803 C program linked with Startup.A51, only changes are CSEG AT 2800H and IDATALEN = 0100H. uVision connects to Monitor (go until main NOT active), loads Programm ok @ 2800 (no Ints used by prog) then stops with PC @0000. Run reenters the Serial Init again, gets stuck there. A hardware reset then gets the PC to 2800, stops there again. Run from there and all works normally. Any idea what's wrong? Thx for your time.
BTW install 0 7F 0 (fixed Baudrate, timer one) is exactly the same!
You need to configure the debugger as explained under: http://www.keil.com/support/docs/3004.htm Reinhard
Many thanks, that solved the problem!