Hello,

I am trying to switch from Atmel to NXP's 89v51RD2 (64kb flash, 768b xram)....

Obviously I have a problem with device settings. It doesn't work right in "compact" and "large" memory model. If code is straightforward, works ok, but when calling a function, uC seems to can't return back. I guess this is a stack problem?

Since this chip was not in Keil's device database, I copied reg file from their site. In the device database, I copied 89C51RD2 and created 89V51RD2. My settings are:

BOOK0=DATASHTSPHILIPSP51_PG.PDF("80C51 Family Programmer's Guide")
BOOK1=DATASHTSPHILIPSP89C51RX2XX_DS.PDF("Data Sheet")
CPU=IRAM(0-0xFF) IROM(0-0xFFFF) XRAM(0-0x2FF) CLOCK(12000000) MODP2
MON=S8051.DLL TP51.DLL("-p51R2")
REGFILE=p89v51rx2.H("Philips")
SFILE="LIBSTARTUPRD2.A51"
SIM=S8051.DLL DP51.DLL("-p51R2")
FLASH="FM.EXE" (DEVICE(89C51RD2xx, $X) HEXFILE(#H,NOCHECKSUMS, NOFILL) COM(1,57600))
DEV_ID=3216
VEN_ID=11
FAM_ID=5


Under "target options" I have selected memory model "large", code rom size "large", operating system "none". "use onchip rom", "use onchip ram" and "use dual DPTR" are all checked.

I also copied a file startup.a51 and modified like written below. Also modified file name in device database (see up).



startuprd2.a51 settings:

IDATALEN 0X0080
XDATASTART 0X0100
XDATALEN 0X02FF
PDATASTART 0X0000
PDATALEN 0X00FF


IBPSTACK : enable
IBPSTACKTOP 0XFF

XBPSTACK : enable
XBPSTACKTOP 0X01FF

PBPSTACK : enable
PBPSTACKTOP 0X00FF


Don't have anymore ideas...... please help :(


regards,

Damjan