I facing a strange issue of continuous reset on my S9S08SG8 board. The SG8 seems to be resetting continously as the scope connected to reset pin shows a square wave of about 25Khz. To isolate the problem I connected only VDD and GND with a 10K pull up to RST. I can still see a 25Khz squre wave on RST.
If I pull up the BKGD/MS pin while booting, RST shows steady 5 V. P&E is unable to program the IC.
Am I missing something ?