emSTAMP Helium (Rev3)
11/23
In principal these displays are offered either with integrated 4-wire resistive touch interface or
with projected capacitive touch interface. The connector J1 supports both touch interfaces.
The capacitive touch controller is connected to the I²C interface on the FLEXCOM3 interface
of the CPU
. The touch controller’
s wake input is driven by PC18 signal
. The touch controller’s
interrupt output is connected to the PC21 signal. Further details about the touch controller
can be found in the display
’
s data sheet.
The brightness of the backlight can be controlled by the PWM signal on pin PC18 (LCDPWM).
The following table describes the function of the data and control lines.
Signal
Description
LCD_D[xx]
18 color data; can also be used in 16-bit mode
LCD_VSYNC
Vertical synchronization signal
LCD_HSYNC
horizontal synchronization signal
LCD_DEN
Data enable signal, if active color data are valid
LCD_CLK
Display clock
LCD_DISP
Backlight power enable signal
LCD_PWM
PWM signal to control the backlight
5.5.1
Color mapping in 16/18bit mode
The following table shows the RGB colour mapping on the LCD_D[xx] pins of the emSTAMP
connector.
LCD_D[xx]
RGB565 (16bit)
RGB666 (18bit)
LCD_D2
-
B0
LCD_D3
B0
B1
LCD_D4
B1
B2
LCD_D5
B2
B3
LCD_D6
B3
B4
LCD_D7
B4
B5
LCD_D10
G0
G0
LCD_D11
G1
G1
LCD_D12
G2
G2
LCD_D13
G3
G3
LCD_D14
G4
G4
LCD_D15
G5
G5
LCD_D18
-
R0
LCD_D19
R0
R1
LCD_D20
R1
R2
LCD_D21
R2
R3
LCD_D22
R3
R4
LCD_D23
R4
R5
