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User Manual
7-3-1-3 MCU SERIAL INTERFACE (3-WIRE SPI)
The 3-wire serial interface consists of serial clock SCLK, serial data SDA and CS#. In 3-wire SPI
mode, the pin D/C# can be connected to an external ground.
The operation is similar to 4-wire serial interface while D/C# pin is not used. There are altogether
9-bits will be shifted into the shift register on every ninth clock in sequence: D/C# bit, D7 to D0 bit.
The D/C# bit (first bit of the sequential data) will determine the following data byte in shift register is
written to the Display Data RAM (D/C# bit = 1) or the command register (D/C# bit = 0).Under serial
mode, only write operations are allowed.
Table 7-3: Control pins of 3-wire Serial Peripheral Interface
Note 7-6: ↑stands for rising edge of signal.
Figure 7-2: Write procedure in 3-wire Serial Peripheral Interface mode
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