Ac Characteristics; Mcu Interface Selection; Mcu Serial Interface (4-Wire Spi) - Waveshare 4.2inch e-Paper V2 User Manual

waveform provided by Waveshare.

6.3 AC CHARACTERISTICS

6.3.1 MCU INTERFACE SELECTION

The IC can support 3-wire/4-wire serial peripheral. MCU interface is pin selectable by BS1
shown in Table 6-1.
Table 6-1: Interface pins assignment under different MCU interface
4-wire serial peripheral interface (SPI)
3-wire serial peripheral interface (SPI) - 9 bits SPI
Note: (1) L is connected to VSS and H is connected to VDDIO.

6.3.2 MCU SERIAL INTERFACE (4-WIRE SPI)

The 4-wire SPI consists of serial clock SCL, serial data SDA, D/C# and CS#. The control pins
status in 4-wire SPI in writing command/data is shown in Table 6-2 and the write procedure 4-wire
SPI is shown in Table 6-2.
Function
Write command
Write data
MCU Interface
Table 6-2: Control pins status of 4-wire SPI
SCL pin
↑
↑
BS1 RES# CS#
L RES# CS#
H RES# CS#
SDA pin
Command bit
Data bit
9
4.2inch e-Paper V2
User Manual
PIN Name
D/C# SCL SDA
DC# SCL
L SCL
D/C# pin CS# pin
L
H
SDA
SDA
L
L