PICASO Datasheet, PDF (10/24 Pages) List of Unclassifed Manufacturers – Embedded Graphics Processor

4D SYSTEMS
PICASO Processor
Programming (ICSP) for more details on
PmmC/Firmware programming.
TX0 pin (Serial Transmit COM0):
Asynchronous Serial port COM0 transmit pin, TX0.
Connect this pin to external serial device receive
(Rx) signal. This pin is 5.0V tolerant.
RX0 pin (Serial Receive COM0):
Asynchronous Serial port COM0 receive pin, RX0.
Connect this pin to external serial device transmit
(Tx) signal. This pin is 5.0V tolerant.
TX1 pin (Serial Transmit COM1):
Asynchronous Serial port COM1 transmit pin, TX1.
Connect this pin to external serial device receive
(Rx) signal. This pin is 5.0V tolerant.
RX1 pin (Serial Receive COM1):
Asynchronous Serial port COM1 receive pin, RX1.
Connect this pin to external serial device transmit
(Tx) signal. This pin is 5.0V tolerant.
LOW: Enable external Audio amplifier.
HIGH : Disable external Audio amplifier.
5.5. Touch Screen Interface
The PICASO supports 4-Wire resistive touch
panels. The diagram below shows a simplified
interface between the PICASO and a touch panel.
5.4. Audio Interface
The exclusive audio support in the PICASO
Processor makes it better than its peers in the
Graphics processor range. PWM ensures better
sound quality with a volume range of 8 to 127. A
simple instruction empowers the user to execute
the audio files. Audio operation can be carried out
simultaneously with the execution of other
necessary instructions.
For a complete list of audio commands please
refer to the separate document titled 'PICASO-
4DGL-Internal-Functions.pdf'.
AUDIO pin (Audio PWM output):
External Amplifier Output pin. This pin provides a
16-bit DAC/PWM audio output to use with an
external audio amplifier. Example circuit below
provides a low cost implementation. If unused
then this pin must be left open or floating.
XR pin (Touch Panel X-Read input):
4-Wire Resistive Touch Screen X-Read analog
signal. Connect this pin to XR or X+ signal of the
touch panel.
XL pin (Touch Panel X-Drive output):
4-Wire Resistive Touch Screen X Drive signal.
Connect this pin to XL or X- signal of the touch
panel.
YU pin (Touch Panel Y-Read input):
4-Wire Resistive Touch Screen Y-Read analog
signal. Connect this pin to YU or Y+ signal of the
touch panel.
YD pin (Touch Panel Y-Drive output):
4-Wire Resistive Touch Screen Y Drive signal.
Connect this pin to YD or Y- signal of the touch
panel.
Optional Power Audio Circuit
AUDENB pin (Audio Enable output):
External Amplifier enable pin. This pin provides
ON/OFF amplifier control. If unused then this pin
must be left open or floating.
5.6. GPIO - General Purpose IO
There are 13 general purpose Input/Output (GPIO)
pins available to the user. These are grouped as
IO1..IO5 and BUS0..BUS7. The 5 I/O pins (IO1..IO5),
provide flexibility of individual bit operations while
the 8 pins (BUS0..BUS7), known as GPIO BUS,
serve collectively for byte wise operations. The IO4
and IO5 also act as strobing signals to control the
GPIO Bus. GPIO Bus can be read or written by
strobing a low pulse (50 nsec duration or greater)
© 2012 4D SYSTEMS
Page 10 of 23
www.4dsystems.com.au