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« on: November 22, 2004, 01:03:52 PM »
No way, I followed the instructions in the errata sheet about P89C51Rx2 page 3 i guess, title:
FUNCTIONAL DEVIATIONS OF P89C51RX2 /01
I did the connection as shown in the two circuits. Vpp pin connected to +5 throw a 3,3 K resistor and to ground throw a 10 uF capacitor. And i connected Psen pin to +5v throw a 10 uF capacitor and to ground throw a 3,3 K resistor. The circuit of the the reset pin is the same of the an461 i only used a 4148 diode instead of the one used in the circuit. The cristal is a 12 MHz. In the meantime i "burned" another chip with a program that make the led blinking just to be sure that the circuit is running the program loaded. Should i increase the value of the two 3,3 K resistor to a 33 K as i read somewhere in the forum. May i send you the schematic of the circuit i am using?
Thank you
Francesco Fontana