Datasheet

4D SYSTEMS uLCD-220RD Display Module
© 2014 4D SYSTEMS Page 8 of 22 www.4dsystems.com.au
uLCD-220RD Display Module
General Purpose I/O 4.2.
There are 16 general purpose Input/Output (GPIO)
pins available to the user. These provide flexibility
of individual bit operations along with serving
collectively for byte wise operations using the BUS
functions
DIABLO16 Alternate Pin Configurations
General Purpose I/O
Digital Input
Digital Output
Bus Read
Bus Write
Analog Read
PA0
✓
✓
✓
✓
✓
PA1
✓
✓
✓
✓
✓
PA2
✓
✓
✓
✓
✓
PA3
✓
✓
✓
✓
✓
PA4
✓
✓
✓
✓
PA5
✓
✓
✓
✓
PA6
✓
✓
✓
✓
PA7
✓
✓
✓
✓
PA8
✓
✓
✓
✓
PA9
✓
✓
✓
✓
PA10
✓
✓
✓
✓
PA11
✓
✓
✓
✓
PA12
✓
✓
✓
✓
PA13
✓
✓
✓
✓
PA14
✓
✓
PA15
✓
✓
Please refer to the separate document titled
'DIABLO16-4DGL-Internal-Functions.pdf' for more
information.
PA0-PA3:
General purpose I/O pins, or can serve as Analog
Input pins. Each pin can be individually set for
INPUT or OUTPUT or ANALOG. Power-Up Reset
default is all INPUTS. When set as Digital Inputs,
the pins are 5V tolerant. Digital GPIO can
source/sink 10mA. For more information see
Chapter 17, ‘Specifications and Ratings’.
When set as Analog Inputs, the pins have a 0 to
3.3V range, and have 12 bit resolution.
For more information, see Section 4.11 ‘Analog
Inputs’.
PA4-PA13:
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 5V tolerant. Digital GPIO can
source/sink 10mA. For more information see
Section 14, ‘Specifications and Ratings’.
PA14-PA15:
Input only pins. These pins can only be Digital
Inputs.
Note: All GPIO pins are 5.0V tolerant.
System Pins 4.3.
+5V IN (Module Voltage Input)
H2 Pin 14, H1 Pin 1:
Module supply voltage input pins. At least one of
these pins must 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.
3.3V_OUT (3.3V Output)
H2 Pin 22:
3.3V Output for the user, limited to approximately
20mA. Used for powering small external devices or
components.
GND (Module Ground)
H2 Pin 11/13, H1 Pin 7:
Device ground pins. Any of these pins can be used
to GND the module, at least one must be
connected to ground.
RESET (Module Master Reset)
H2 Pin 20, H1 Pin 9:
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)
H2 Pin 18:
Output dedicated to enable or disable and
external amplifier, where required.
AUDIO (Filtered PWM Audio Output)
H2 Pin 16:
Output specifically for Audio. This pin is designed
to connect directly to an external amplifier circuit,
and is a filtered PWM signal from the DIABLO16
Processor.