ULCD-28PTU datasheet(7/22 Pages) ETC2

Part #	ULCD-28PTU

Description	2.8" microLCD PICASO Display

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4D SYSTEMS

µLCD-28PTU

Page 7 of 22

www.4dsystems.com.au

4. Hardware Interface - Pins

The μLCD-28PTU 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-28PTU 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 (Note for IO1, IO2 and IO3 below) 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

as

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

separate document titled:

“PICASO-4DGL-Internal-Functions.pdf”

IO1-IO5 pins (excluding IO3) (2 x GPIO pins):

General purpose I/O pins. Each pin can be

individually set for INPUT or an OUTPUT.

IO1 pin (Frame Mark pin):

The IO1 pin has 2 functions. It can be used as a

GPIO pin but can also be used to detect the start

of a Frame. When used as a GPIO pin, simply

connect an Input/Output to the IO1 pin on the H1

header. When using IO1 for Frame Mark, simply

leave the IO1 pin on the H1 header disconnected,

and read the status of IO1 as an Input.

IO2 pin (Lithium Battery Status pin):

The IO2 pin has 2 functions. It can be used as a

GPIO pin but can also be used to tell when the

Lithium battery has reached a low level (3.7V) and

needs to be charged. When used as a GPIO pin,

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