PICASO datasheet(10/24 Pages) ETC2

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4D SYSTEMS

PICASO Processor

Page 10 of 23

www.4dsystems.com.au

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.

Audio Interface

5.4.

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.

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.

LOW: Enable external Audio amplifier.

HIGH : Disable external Audio amplifier.

Touch Screen Interface

5.5.

The PICASO supports 4-Wire resistive touch

panels. The diagram below shows a simplified

interface between the PICASO and a touch panel.

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.

GPIO - General Purpose IO

5.6.

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)

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