The continuous clock series interface (CCSI) provides access to the programmable functions and registers, SRAM data of the device. The interface contains two input digital pins, they are the serial data input (SIN) and serial clock (SCLK). Moreover, there is an another wire called serial data output (SOUT) as the output digital signal of the device. The SIN is set to HIGH when device is in idle status and the SCLK must be existent and continuous all the time considering as the clock source of internal Frequency Multiplier, the SOUT is used to transmit the data or read the data of internal registers.

This protocol can support up to 32 devices cascaded in a data chain. The devices receive the chip index command after power up. The chip index command configured addresses of the devices from 0x00 up to 0x1F according to the sequence that receives the command. Then the controller can communicate with all the devices through the broadcast way or particular device through non-broadcast way.

The broadcast is mainly used to transmit function control commands. All the devices in a data chain receive the same data in this way. The non-broadcast is mainly used to transmit function control commands or display data, and each device receives its own data in this way. These two ways are distinguished by the command identification.