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After inserting the external oscillator, and making it work, u can reprogram the device with default fuse bits to make it work without the eternal oscillator too…
@Ajeesh: I understand that, and have implemented it too before and even in this project too, 8 address lines and 4 data lines, that has been taken care of. The thing is that I need only one of the 4 units working at a time so that they all dont load the antenna at the same time. I want them working cyclically, which is why I would require powering the 4 units on and off separately. The address and data bus run through both HT12E and HT12D. I need to find a way to send/receive the serial data to/from the encoder/decoder to specific RF modules, not all at a time.
@A M Bhatt, Can u then suggest a way to power only one of the four devices at a time, so that when I give 00 on the input, device 1 must be powered, 01, device 2 must be powered and so on…The devices in question are RF link transmitters and receivers ( 433Tx, 433Rx, 315Tx, 315Rx ). At a given point of time i need to power only one of the modules. They dont have EN, etc pins. Please forgive me for my ambuigity in the earlier post.
One more solution that worked for me…If u have another arduino or atmegaXX microcontroller, configure one of the pins to toggle at 1MHz and connect it to XTAL1 (Note that power must be connected to the faulty microcontroller). Wait for a few seconds. If it still doesnt work, try connecting it to XTAL2 (Because i dont remember which pin i connected it to)
This is the code for the recovery atmega:
void main(){
DDRB|=1<<0;
PORTB|=1<<0;
while(1){
PORTB^=1<<0;
_delay_us(1);
}
}
Cheers!
