System Installation
ROBO-8713 Series User’s Manual
3-9
3.9
Display Output (For ROBO-8713UGA, ROBO-8713SGA only)
LCD Display Interface
Two LCD display interfaces, TMDS & LVDS are provided by ROBO-8713UGA &
ROBO-8713SGA.
TV Output Interface
Composite Video, S-Video and Scart R/G/B interfaces are 3 kinds of TV outputs
provided by this system. Please refer to connector J14 for more details. Each time
when the system is on, the system auto-detects one interface for outputting display
information.
A connection to one of these three different interfaces will result different signal line
impedance combinations. The selection will be made base on the different
impedances combinations.
3.10 GPIO
The ROBO-8713 series provides 8 programmable input or output ports that can be
individually configured to perform a simple basic I/O function. Users can configure
each individual port to become an input or output port by programming register bit
of I/O Selection. To invert port value, the setting of Inversion Register has to be
made. Port values can be set to read or write through Data Register.
3.10.1 Pin
assignment
J25: General Purpose I/O Connector
PIN No.
Signal Description
1
General Purpose I/O Port 0 (GPIO0)
2
General Purpose I/O Port 1 (GPIO1)
3
General Purpose I/O Port 2 (GPIO2)
4
General Purpose I/O Port 3 (GPIO3)
5 Ground
6
General Purpose I/O Port 4 (GPIO4)
7
General Purpose I/O Port 5 (GPIO5)
8
General Purpose I/O Port 6 (GPIO6)
9
General Purpose I/O Port 7 (GPIO7)
10 +5V
All General Purpose I/O ports can only apply to standard TTL
±
5% signal level
(0V/5V), and each source sink capacity up to 12mA.
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