3.5 MCU Interface
3.5.1MCU interface selection
GDEH075Z
9
0 can support 4-wire or 3-wire serial peripheral MCU interface, which is
pin selectable by BS1 pin. The interface pin assignment for different MCU interfaces
is shown in Table 3.5-1.
Note
(1)
L is connected to VSS
(2)
H is connected to VDDIO
Table 3.5-1:
Interface pin assignment for different MCU interfaces
Pin Name
MCU Interface
BS1
RES#
CS#
D/C#
SCL
SDI
SDO
4-wire serial peripheral
interface (SPI)
L
Required Required Required SCL
SDI
SDO
3-wire serial peripheral
interface (SPI) – 9 bits SPI
H
Required Required L
SCL
SDI
SDO
3.5.2 MCU Serial Peripheral Interface (4-wire SPI)
The 4-wire SPI consists of serial clock SCL, serial data input SDI, D/C# and CS#.
The control pins status in 4-wire SPI in writing command/data is shown in Table
1.5-2 and the write procedure in 4-wire SPI is shown in Figure 1.5-1..
Table 3.5-2 : Control pins status of 4-wire SPI
Function
SCL pin
SD
I
pin
D/C# pin
CS# pin
Write command
↑
Command bit
L
L
Write data
↑
Data bit
H
L
GDEH075Z90
16
／
38
7.5 inch Series
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