Mcu Interface; Mcu Interface Selection; Mcu Serial Interface (4-Wire Spi) - Waveshare 13.3 e-Paper (K) User Manual

7.4 MCU INTERFACE

7.4.1 MCU INTERFACE SELECTION

The pin assignment at different interface mode is summarized in Table 7-4-1. Different MCU
mode can be set by hardware selection on BS1 pins. The display panel only supports 4-wire SPI or
3-wire SPI interface mode.
Pin Name
Bus interface
BS1=L 4-wire SPI
BS1=H 3-wire SPI

7.4.2 MCU SERIAL INTERFACE (4-WIRE SPI)

The serial interface consists of serial clock SCL, serial data SDA, D/C#, CS#. This interface
supports Write mode and Read mode.
Function
Write command
Write data
In the write mode SDA is shifted into an 8-bit shift register on every rising edge of SCL in the
order of D7, D6, ... D0. The level of D/C# should be kept over the whole byte. The data byte in the
shift register is written to the Graphic Display Data RAM/Data Byte register or command Byte register
according to D/C# pin.
Data/Command Interface
SDA
SDA
SDA
CS#
L
L
Note: ↑ stands for rising edge of signal.
17
SCL CS#
SCL CS#
SCL CS#
D/C#
L
H
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Control Signal
D/C# RES#
D/C# RES#
D/C# RES#
SCL
↑
↑