# short miso and mosi pins in 3 wire spi

I have to interface a uc to a ADF7020-1 and I want use adf7020-1 as master and uc as slave in 3-wire spi mode. adf7020-1 have txrxdata that interfacing with uc(it has mosi and miso pins). how did connect 3-wire SPI into uc? do need isolate mosi and miso pins with diod? Can i Short MISO and MOSI? please help me thanks

short miso and mosi to interface with uc

• I don't think the ADF7020 is designed to be a SPI master. Better use your uc as master. Dec 28 '18 at 13:04
• Indeed. Looking at the datasheet, SCLK is an input. Therefore, it cannot be the SPI master. Dec 28 '18 at 14:22

DATA CLK and DATA I/O are for data to be sent or received on the RF link (0.15 to 200 kbps). This isn't an SPI interface. You need to connect this to something that can continuously stream data at the rate of your RF link. If you are connecting this to a micro, you probably want these pins connected to GPIOs, and DATA CLK triggering a high-priority interrupt (based on a very quick look at the datasheet).
SLE, SCLK, SDATA, and SREAD are an SPI interface (as far as I can tell from a quick read of the datasheet). SDATA would connect to MOSI and SREAD connects to MISO. I don't see any reason you should want to connect MOSI and MISO to each other.