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ULCD-28PTU Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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7 / 22 page 4D SYSTEMS µLCD-28PTU © 2014 4D SYSTEMS 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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