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ULCD-24PT(GFX) Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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ULCD-24PT(GFX) Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers |
7 / 23 page µLCD-24PT(GFX) Data Sheet 2. Hardware Interface - Pins The μLCD-24PT(GFX) provides both a hardware and a software interface. This section describes in detail the hardware interface pins of the device. 2.1 Serial Ports - COM0, COM1 UARTS The PICASO-GFX2 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 256K 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. In-Circuit-Serial- Programming (ICSP) for more details on PmmC programming. 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. © 2011 4D Systems www.4dsystems.com.au Page 7 of 23 |
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