5.3 Memory LCD-TFT Display
A 1.28-inch SHARP Memory LCD-TFT has been added to the board to enable interactive applications to be developed. The display has
a high resolution of 128 by 128 pixels and consumes very little power. It is a reflective monochrome display, so each pixel can only be
light or dark, and no backlight is needed in normal daylight conditions.
The display interface consists of an SPI-compatible serial interface and some extra control signals. Data are sent to the display one line
(128 bits) at a time.
The Memory LCD-TFT display is shared with the kit Board Controller, allowing the Board Controller application to display useful infor-
mation when the user application is not using the display. The EFM8 MCU always controls ownership of the display using the
EFM_DISP_ENABLE signal:
• 0: The Board Controller has control of the display.
• 1: The user application (EFM8) has control of the display.
Data are clocked in on EFM_DISP_MOSI (P1.2) when EFM_DISP_CS (P1.5) is high, and the clock is sent on EFM_DISP_SCLK
(P1.0). The maximum supported clock speed is 1 MHz.
Please refer to the display application information for details on driving the display:
http://www.sharpmemorylcd.com/1-28-inch-memory-lcd.html
0: BC controls display
1: EFM controls display
EFM_DISP_ENABLE
8
P1.0 (SPI1)
P1.2 (SPI1)
P1.5 (GPIO)
P2.6 (GPIO)
Figure 5.3. 128x128 Pixel Memory LCD
5.4 Humidity and Temperature Sensor
The EFM8SB2-SLSTK2011A board includes a Silicon Labs Si7021 humidity and temperature sensor to enable datalogging applica-
tions. The EFM8 MCU communicates with this sensor over the I2C / SMBus hardware interface.
Figure 5.4. Humidity and Temperature Sensor
UG238: EFM8SB2-SLSTK2011A User's Guide
Peripherals
silabs.com
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