PICASO datasheet(8/24 Pages) ETC2

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4D SYSTEMS

PICASO Processor

Page 8 of 23

www.4dsystems.com.au

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.

Display Interface

5.1.

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

1 Read Display Status Register

0 Write Display Index Register

1 Read Display GRAM Data

0 Write Register or GRAM Data

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.

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

Write High Pulse

tWH

Write Bus Cycle Total

tWT

100

Write Data Setup

tDS

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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