e z L C D -‐ 4 0 5
|
28
Rev.
© 2016 Earth Computers Tech. Inc.
Max = +3.3V
MOSI
CN1
Input
SPI Master Output Slave Input signal
Min = 0V
Max = +3.3V (
Not
+5V tolerant)
SPCK
CN1
Input
SPI Clock Input
Min = 0V
Max = +3.3V (
Not
+5V tolerant)
Warning:
SPI inputs
are not
+5V tolerant. Driving the inputs with voltages out of the range
specified in the table above, may damage the ezLCD-‐405 and void the warranty.
Receiving the data from the ezLCD-‐405
Since:
·∙ The ezLCD-‐405 is configured as an SPI Slave and
·∙ All transmissions through the SPI interface have to be initiated by the Master, it is the user
responsibility to query the ezLCD for any new data, like for example: touch screen coordinates.
Each time, the byte is send through the SPI interface to the ezLCD, the unit responds on the
MISO pin. If you want to query the ezLCD without sending any command: send 0 to the ezLCD.
ezLCD-‐405 Power-‐Up Ready Transmission
If the SPI is set as the "Default Transmitter", the ezLCD-‐405 sends EZLCD_READY byte (
EA
hex,
234
dec). The EZLCD_READY byte is sent one time only, upon the power-‐up when the ezLCD-‐
405 SPI
interface is ready to receive the commands.
The "Default Transmitter" can be set by the ezLCDconfig utility. See Chapter:
Firmware
Customization
.
Summary of Contents for ezLCD-405
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