Data Sheet

Product Specification
Ver 1.2  29 / 43
7-3-2-3) MCU Serial Interface (3-wire SPI)
The 3-wire serial interface consists of serial clock SCL, serial data SDA and CSB.
In 3-wire SPI mode, D0 acts as SCL, D1 acts as SDA, The pin DC can be connected to an external ground.
The operation is similar to 4-wire serial interface while DC pin is not used. There are altogether 9-bits will be shifted into the shift register
on every ninth clock in sequence: DC bit, D7 to D0 bit. The DC bit (first bit of the sequential data) will determine the following data byte
in shift register is written to the Display Data RAM (DC bit = 1) or the command register (DC bit = 0).Under serial mode, only write
operations are allowed.
Table 7-3: Control pins of 3-wire Serial Peripheral Interface
Note 7-5: ↑stands for rising edge of signal
Figure 7-2: Write procedure in 3-wire Serial Peripheral Interface mode
Function CSB DC SCL
Write Command L Tie LOW ↑
Write data L Tie LOW ↑
.
2.7" e-Paper (B)