In a materially similar way to asynchronous data except you enable the clock, and output a clock signal associated with the transmitted data, so an additional pin to configure.
I'm sure you could find some examples if you looked a little.
Serial Synchroneous transmittion can be typically by SPI (highest bandwidth, 3 or 4 wires MISO+MOSI/SCK/NSS), or USART (RX/TX/CK)
I2C bus (SDA/SCL) is also synchroneous bus.
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