PICASO-OGM Datasheet, PDF (9/22 Pages) List of Unclassifed Manufacturers – OEM Graphics Module

4D SYSTEMS
SD_SDI (SD Serial Data Input)
Pin 14:
This is for SD memory card use only. Connect this
pin to the Serial Data Input (SDI) signal of an
external SD card connector if not using the on-
board connector, providing flexibility for the end
product. Using both on-board and external SD is
not advised. Leave Open if external SD is N/A.
BACKLITE (External Display Backlight Control)
Pin 15:
This pin allows external control of the backlight, to
enable/disable/dim the backlight on the display. If
an external PWM signal is connected to this pin, it
can be used to drive the backlight and dim as
required, or more simply a digital on/off signal to
enable/disable as required.
DISPON (PICASO Display Backlight Control)
Pin 16:
This is directly connected to the PICASO Processor
and allows the PICASO to enable or disable the
backlight on the display. The PICASO Processor is
however unable to change the level of brightness
on the display as it does not offer PWM
functionality on this pin. In order to gain dimming
control, the BACKLITE pin should be used with an
external PWM signal. If PICASO backlight control is
required, simply join BACKLIGHT (Pin 15) with
DISPON (Pin 16) externally, allowing the PICASO to
then control the backlight directly.
PICASO OGM Module
5. PmmC/Firmware Programming
The PICASO processor used in the PICASO OGM
module is a custom graphics processor. All
functionality including the high level commands
are built into the chip. This chip level configuration
is available as a Firmware/PmmC (Personality-
module-micro-Code) file.
A PmmC file contains all of the low level micro-
code information (analogy of that of a soft silicon)
which define the characteristics and functionality
of the device. The ability of programming the
device with a PmmC file provides an extremely
flexible method of customising as well as
upgrading it with future enhancements.
A PmmC file can only be programmed into the
device via its COM0 serial port.
The PmmC file is programmed into the device with
the aid of Workshop 4, the 4D Systems IDE
software (See Section 10). To provide a link
between the PC and the ICSP interface, a specific
4D Programming Cable or Adaptor is required and
is available from 4D Systems.
Using a non-4D programming interface could
damage your display, and void your Warranty.
NOTE: The typical interface to a 4D Programming
cable or adaptor is a vertical or horizontal 5-way
2.54mm pitch male pin header. The 4D
Programming cables and adaptors provide a 5V
supply which can be used to power up 4D
products. The PICASO OGM Module however has
no on board regulation of its own, so cannot be
directly connected to a 4D Programming cable or
adaptor without an off board regulator to provide
a stable regulated 3.3V supply for the OGM
Module. Once a suitable 3.3V supply is provided to
the OGM Module, then the TX0, RX0 and RESET
lines can be utilized to program the on board
PICASO Processor as usual.
4D Systems has a BaseBoard to provide as an
example of how the PICASO OGM Module can be
connected to a host PCB, and how it can be
powered and programmed using a 4D
Programming Cable or Adaptor. Please contact 4D
Systems Sales for more information. More
information about this can be found in Section 8.2
© 2013 4D SYSTEMS
Page 9 of 22
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