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Re: very important schematic
crystal = 12Mhz with 27pF cap
for reset
r = 10k
c = 10uf
for the software you have to write your own or ask for companys support the isp programming is based in Intel-Hex Records you can find it in the datasheet, i think there is other devices that uses isp maybe...
8051 program
or you can connect the sensor(it have to be ttl levels) to any port like p1.0 and do this
CLR P1.1 ;buzzer is connected to port p1.1
JNB P1.0,$
JB P1.0,$ ;wait for LOW edge trigger
alarm:
SETB P1.1
CALL DELAY
CLR P1.1
this is the schematic this may help for what i have explaned before(there was something wrong in the explnation you don't need a nor).
EA must be lowed to enable external code and also check that no security bit lock for external code exeution.
if you need help on software i can help.
what you need to do is to place the boot program at the end of the extenal e2prom by a programmer, the boot pgm will initiate the serial comunication with the pc to program the e2prom from the begining, you need to do a hardware activities to enable writing to the e2prom while reading...
answers:
-speed requirements ? 9600bps or any RS232 standard
-security ? no need (secured by sotware)
-power consumption requirements ? doesn't matter
-data or voice (i guess data because of -51) ? data
-price target ? doesn't matter
thanks
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