PICASO Datasheet, PDF (8/24 Pages) List of Unclassifed Manufacturers – Embedded Graphics Processor

4D SYSTEMS
5. Pin Description
The PICASO Processor provides both a hardware
and a software interface. This section describes in
detail the hardware interface pins of the device.
5.1. Display Interface
The PICASO supports LCD and OLED displays with
an 80-Series 16-bit wide CPU data interface. The
connectivity to the display is easy and straight
forward. The PICASO generates all of the necessary
timing to drive the display.
CS RS RD WR Operation
0 0 0 1 Read Display Status Register
0 0 1 0 Write Display Index Register
0 1 0 1 Read Display GRAM Data
0 1 1 0 Write Register or GRAM Data
1 X X X No Operation
Display Operation Table
D0-D15 pins (Display Data Bus):
The Display Data Bus (D0-D15) is a 16-bit
bidirectional port and all display data writes and
reads occur over this bus. Other control signals
such as RW, RD CS, and RS synchronise the data
transfer to and from the display.
CS pin (Display Chip Select):
The access to the display is only possible when the
Display Chip Select (CS) is asserted LOW. Connect
this pin to the Chip Select (CS) signal of the display.
RS pin (Display Register Select):
The RS signal determines whether a register
command or data is sent to the display.
LOW: Display index or status register is
selected.
HIGH: Display GRAM or register data is
selected.
PICASO Processor
Connect this pin to the Register Select (RS) signal
of the display. Different displays utilise various
naming conventions such as RS, A0, C/D or similar.
Be sure to check with your display manufacturer
for the correct name and function.
RES pin (Display Reset):
Display RESET. PICASO initialises the display by
strobing this pin LOW. Connect this pin to the
Reset (RES) signal of the display.
DCENB pin (External DC/DC Enable):
DC-DC high voltage enable signal. This maybe the
high voltage that drives the LCD backlight or the
OLED panel supply.
WR pin (Display Write):
This is the display write strobe signal. The PICASO
asserts this signal LOW when writing data to the
display in conjunction with the display data bus
(D0-D15). Connect this pin to the Write (WR) signal
of the display.
Item
Sym Min Typ Max Unit
Write Low Pulse
tWL 50 - - ns
Write High Pulse
tWH 50 - - ns
Write Bus Cycle Total tWT 100 - - ns
Write Data Setup
tDS 25 - - ns
RD pin (Display Read):
This is the display read strobe signal. The PICASO
asserts this signal LOW when reading data from
the display in conjunction with the display data
bus (D0-D15). Connect this pin to the Read (RD)
signal of the display.
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