JT, That is the purpose of SPI. You would load the SSPSR register with the first 8 data bits to send and, as they were being sent the same register is being loaded with the firts 8 bits of data from the A/D. You just have to do it 1 byte at a time but it should be Much Much faster than bitbanging it. Read about it in the spec sheet for the 16F818. It's under SSP port....