Hi I have bben working with the at48c4051 and have not had any problems at all - i can use the uart, interrupts, timers, etc; but I just started working with the AT89C51RC and i have not able to do anything with it, not event light up an led!! The only connections to the chip are the Rxd, Txd, p3_7 where i connect the led and reset to GND (and of course Vcc and Vss). Does anybody know if I need to set something first? or if i need to connect any other pins? i have been reading and so far they don't require anything else. I would appreciate any help. Thanks in advance
Anyway, about the EA, if you are talking about the "Enable All Interrupts" pin, i am enabling it. there is NO SUCH "PIN" that is an SFR bit. I refer to !EA. fFrom "the bible" External Program Memory is accessed under two conditions: Whenever signal EA is active NOTE "active means low!, it is !EA, NOT EA Erik