ULCD-43 datasheet(7/21 Pages) ETC2

7 / 21 page

4D SYSTEMS

µLCD-43

Page 7 of 21

www.4dsystems.com.au

4. Hardware Interface - Pins

The µLCD-43 provides both a hardware and

software interface. This section describes in detail

the hardware interface pins of the device.

Serial Ports - COM0, COM1 UARTS

The µLCD-43 has two

dedicated

hardware

Asynchronous Serial ports that can communicate

with external serial devices. These are referred to as

the COM0 and the COM1 serial ports.

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. ‘Firmware / PmmC Programming’ for

more details on this subject.

TX0 pin (Serial Transmit COM0):

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):

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.

RX1 pin (Serial Receive COM1):

Asynchronous Serial port COM1 receive pin, RX1.

Connect this pin to external serial device transmit

(Tx) signal. This pin is 5.0V tolerant.

General Purpose I/O

There are 13 general purpose Input/Output (GPIO)

pins available to the user. These are grouped as

IO1..IO5 and BUS0..BUS7. Power-Up Reset default

is all INPUTS.

The 5 I/O pins (IO1..IO5), provide flexibility of

individual bit operations while the 8 pins

(BUS0..BUS7),

known

GPIO

BUS,

serve

collectively for byte wise operations. The IO4 and

IO5 also act as strobing signals to control the GPIO

Bus. GPIO Bus can be read or written by strobing a

low pulse (50ns duration or greater) the

IO4/BUS_RD or IO5/BUS_WR for read or write

respectively. For detailed usage refer to the

document: “PICASO-4DGL-Internal-Functions.pdf”

IO1-IO3 pins (3 x GPIO pins):

General purpose I/O pins. Each pin can be

individually set for INPUT or an OUTPUT.

IO4/BUS_RD pin (GPIO IO4 or BUS_RD pin):

General Purpose IO4 pin. Also used for BUS_RD

signal to read and latch the data in to the parallel

GPIO BUS0..BUS7.

IO5/BUS_WR pin (GPIO IO5 or BUS_WR pin):

General Purpose IO5 pin. Also used for BUS_WR

signal to write and latch the data to the parallel

GPIO BUS0..BUS7.

BUS0-BUS7 pins (GPIO 8-Bit Bus):

8-bit parallel General purpose I/O Bus.

Note: All GPIO pins are 5.0V tolerant.

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