ULCD-70DT datasheet(7/22 Pages) ETC2

Part #	ULCD-70DT

Description	7.0??DIABLO16 Intelligent Display Module

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4D SYSTEMS

uLCD-70DT Display Module

Page 7 of 22

www.4dsystems.com.au

4. Hardware Interface - Pins

The uLCD-70DT Module provides both a hardware

and software interface. This section describes in

detail the hardware interface pins of the device.

Serial Ports – TTL Level Serial

The DIABLO16 Processor has three hardware

asynchronous serial ports (COM1 – COM3) that

can be configured on a variety of the processors

GPIO pins. TX/RX0 (COM0) is dedicated and its

pins are fixed. All of the DIABLO16’s serial ports

can be used to communicate with external serial

devices.

TX/RX0 are referred to as COM0, and is the only

one used for programming the DIABLO16 itself.

The primary features are:



Full-Duplex 8 bit data transmission and

reception.



Data format: 8 bits, No Parity, 1 Stop bit.



Independent Baud rates from 300 baud

up to 600K baud.



Single byte transmits and receives or a

fully buffered service. The buffered

service feature runs in the background

capturing

and

buffering

serial

data

without the user application having to

constantly poll any of the serial ports. This

frees up the application to service other

tasks.

A single byte serial transmission consists of the

start bit, 8-bits of data followed by the stop bit.

The start bit is always 0, while a stop bit is always

1. The LSB (Least Significant Bit, Bit 0) is sent out

first following the start bit. Figure below shows a

single byte transmission timing diagram.

COM0 is also the primary interface for 4DGL user

program downloads and chip configuration PmmC

programming.

Once

the

compiled

4DGL

application

program

(EVE

byte-code)

is

downloaded and the user code starts executing,

the serial port is then available to the user

application. Refer to Section 5 for more details on

PmmC/Firmware programming.

TX0 pin (Serial Transmit COM0):

Dedicated

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):

Dedicated 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. This can be