gen4-HMI Display Modules
gen4-uLCD-50D Page 9 of 29 www.4dsystems.com.au
PA12-PA13:
PA12 and PA13 are reserved for the capacitive touch
controller on the DCT-CLB model. These pins should
not be connected else Touch performance may be
degraded. There are 4.7K pullup resistors on each of
these GPIO. Avoid these pins in normal situations on
this DCT-CLB model. Using these pins on non-touch
(D/D-CLB) and resistive touch (DT) modules is however
OK, or in situations where touch is not required. These
pins are 5V tolerant.
PA14-PA15:
General purpose I/O pins. Each pin can be individually
set for INPUT or OUTPUT. Power-Up Reset default is
all INPUTS. When set as Digital Inputs, the pins are
3.3V tolerant. Digital GPIO can source/sink 10mA.
Under special situations, these pins can be utilised for
a high speed I2C interface. Please refer to table in
Note: Digital GPIO pins are 5.0V tolerant, except PA14-
PA15, which are 3.3V tolerant only. PA0-PA3 are 3.3V
tolerant only. 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 DIABLO16 Processor. This pin is a 3.3V level
PWM output to drive an external amplifier with
DIABLO16 generated Audio, via an external filtering
circuit to turn digital PWM into Analog. Note that
AUDENB must be enabled in DIABLO16 for any input
signal to be heard.
4.4.
Alternate Pin Function Overview
Most of the GPIO pins have an alternate function other
than being for General Purpose I/O.
GPIO pins can be configured to be SPI, I
2
C, Serial or a
range of other functions.
Note: Not all pins can be configured to be any of the
alternate pin functions. Please refer to the tables.
Please refer to the following tables which illustrate
which pins can be associated alternative functions.
The previous table illustrates which of the GPIO can be
used for the four different I/O Support Functions.
Note: Once a pin is allocated to an alternate function,
another pin cannot also be allocated to the same
alternate function.
Please refer to the separate document titled
'
DIABLO16-4DGL-Internal-Functions.pdf
' for more
information on how to set the alternate pin
configurations.
The Alternate pin functions have been broken up into
a few tables for simplification. There are
communication based functions, and I/O support
based functions.
DIABLO16 Alternate Pin Configurations
I/O Support Functions
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In
PA0
✓
✓
PA1
✓
✓
PA2
✓
✓
PA3
✓
✓
PA4
✓
✓
✓
✓
PA5
✓
✓
✓
✓
PA6
✓
✓
✓
✓
PA7
✓
✓
✓
✓
PA8
✓
✓
✓
✓
PA9
✓
✓
✓
✓
PA10
✓
PA11
✓
PA12
✓
PA13
✓
PA14
PA15
Содержание gen4-HMI Series
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