This is a Serial Port Downloader software, supporting in-circuit serial programming of ADUC841.
Use a cable and link your PC serial port with the microcontroller TX and RX through MAX232 level convertor.
Set the configuration options inside PC program according with your crystal frequency, microconvertor baud rate, PC baud rate.
Then tying toward ground (0 logic level) the PSEN pin, press and release the reset switch.
Then you can use the PC program and download your hex file.
Read more :
**broken link removed**
for how to use the PC download software
Sorry to dissapointed you, but believe me, ADUC841 can't be programmed like AT89S51, even if you've seen the MOSI, MISO, SS/ pins.
Those pins performs SPI interface. It has nothing to do with programming pins of AT89S51.
The only way that ADUC841 can be programmed is through serial interface (TX, RX and GND) like I mentioned before.