...........continued
Pin number Name
Description
9
IRQ/GPIO
Interrupt request line or general purpose I/O
10
SPI_SS_B/GPIO Slave select for SPI or general purpose I/O
11
I2C_SDA
Data line for I
2
C interface. Always implemented, bus type.
12
I2C_SCL
Clock line for I
2
C interface. Always implemented, bus type.
13
NC
Not connected
14
NC
Not connected
15
SPI_SS_A
Slave select for SPI. must preferably be unique.
16
SPI_MOSI
Master Out Slave In (MOSI) line of serial peripheral interface. Always
implemented, bus type
17
SPI_MISO
Master In Slave Out line (MISO) of serial peripheral interface. Always
implemented, bus type.
18
SPI_SCK
Clock for serial peripheral interface. Always implemented, bus type.
19
GND
Ground
20
VCC
Power for extension board
4.6
Interface Selector (SW1)
The maXTouch Pro LCD has a series of selector switches to control the mode the ILI9844 controller operates in.
These switches can be found on the back of the LCD. The table below details how the switches change the mode.
and the switch settings have to match the software that is loaded on the host microcontroller.
IM2
IM1
IM0
Interface
Pins in use
0
0
0
18-bit parallel bus
DB[17:0], CS, D/C, WE, RE
0
0
1
9-bit parallel bus
DB[8:0], CS, D/C, WE, RE
0
1
0
16-bit parallel bus
DB[15:0], CS, D/C, WE, RE
0
1
1
8-bit parallel bus
DB[7:0], CS, D/C, WE, RE
1
0
0
Not Supported
1
0
1
3-wire/9-bit SPI mode
MOSI, MISO, SCLK, CS,
1
1
0
Not Supported
1
1
1
4-wire/8-bit SPI mode
MOSI, MISO, SCLK, CS, D/C
4.7
Debug Header
Extra debug connections of the maXTouch controller is provided for easy access.
Pin Number
Pin Name
Pin Description
1
NC
No connect
2
NC
No connect
3
IRQ
Interrupt (maXTouch) Active-Low
4
Reset
Reset (maxTouch) Active-Low
Curiosity and Xplained Pro Boards
©
2020 Microchip Technology Inc.
DS70005414B-page 9
