Serial com with internal oscillator

[mikendee]

Hi Ron,

I think this will be the solution for me. I will have to use an extra pin to select the AD7730 but then I have 2 extras from not using an xtal. I can't see whether it is high impedance when not selected from the Datasheet but will check in a breadboard to see. I'll have to learn to use a pic as a slave in SPI but hopefully that won't be too tricky.

Thankyou both for your help. I'd be stumbling around in the dark without it.

Thanks,

Mike

[mister_e]

SPI or I2C, synchronous serial communication is really the way to go with an internal oscillator. If you're using SPI/I2C device, no harm to use the internal oscillator as it's a synchronous communication, but for RS232 asynch... this will cause you problem one day or another... unless you're really lucky!