gen
4 Display Module Series gen4-uLCD-24PT - 2.4”
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2017 4D SYSTEMS Page 8 of 22 www.4dsystems.com.au
IO4/BUS_RD pin (GPIO IO4 or BUS_RD pin):
General Purpose IO4 pin. Also used for BUS_RD signal
to read and latch the data in to the parallel GPIO
BUS0..BUS7.
IO5/BUS_WR pin (GPIO IO5 or BUS_WR pin):
General Purpose IO5 pin. Also used for BUS_WR
signal to write and latch the data to the parallel GPIO
BUS0..BUS7.
BUS0-BUS7 pins (GPIO 8-Bit Bus):
8-bit parallel General purpose I/O Bus.
Note: GPIO pins are 5.0V tolerant. All pins output at
3.3V levels.
4.3.
System Pins
+5V IN (Module Voltage Input)
Module supply voltage input pins. Both of these pins
should be connected to a stable supply voltage in the
range of 4.0 Volts to 5.5 Volts DC. Nominal operating
voltage is 5.0 Volts. Note backlight brightness will be
lower for voltages under 5.0V.
GND (Module Ground)
Device ground pins. At least two pins should be
connected to ground.
RESET (Module Master Reset)
Module Master Reset pin. An active low pulse of
greater than 2μs will reset the module. Internally
pulled up to 3.3V via a 10K resistor. Only use open
collector type circuits to reset the device if an
external reset is required.
AUDENB (Audio Enable Output)
Output dedicated to enable or disable and external
amplifier, where required.
AUDIO (PWM Audio Output)
Output specifically for Audio. This pin is a PWM
output from the Picaso Processor. This pin is a 3.3V
level PWM output to drive an external amplifier with
Picaso generated Audio, via an external filtering
circuit to turn digital PWM into Analog. Note that
AUDENB must be enabled in Picaso for any input
signal to be heard.
4.4.
I2C
There is one I
2
C Master Channel on the Picaso
processor. The I
2
C channel is Master only, and cannot
be configured to be a slave at this time.
To setup the I
2
C Channel the following 4DGL function
is used:
I2C_Open(Speed);
Where ‘Speed’ is the desired I2C Bus speed. There
are then an array of functions, typical of any I2C
capable processor, such as Close, Start, Stop, Restart,
Read, Write, Ack, Nack, etc…
Please refer to the separate document titled 'Picaso
4DGL Internal Functions’ for more information on
how to use the I
2
C functions, along with the separate
document titled ‘Picaso-Processor Datasheet’.
