Parallel Port

The Parallel port can only be used for graphics display and offers the fastest communication protocol available. When possible, choose displays with 16-bit Parallel port communication for optimal performance.

Typical connections for TFT displays with Parallel port interfaces, from the MCU perspective:

CS: Output - TFT Chip Select.

RS/DC: Output - Data/Command Control, indicating the type of data currently being sent.

WR: Output - Write latch pin for display data.

RD: Output - Read latch pin for display data.

RESET: Output - Hardware reset pin for the graphics display IC.

DB0 to DB15: Output - 16-bit Data communication port. For 8-bit data commands, only the lower byte is used; for graphic data, both the lower and upper bytes are used. Connect to two 8-bit ports on an 8-bit MCU or one 16-bit port on a 16-bit MCU.

SD_CS: Output - Chip Select for the SD Card, if supported, via SPI communication. Not all TFT displays include an SD Card slot.

BL: Output - Digital control pin for the back-light LED. Use PWM for back-light brightness adjustment. If always ON, connect to a 3.3V VCC with a pull-up resistor.

VCC: Power - Connect to a 3.7–5V source if the TFT has a built-in 3.3V LDO/Regulator; otherwise, connect to 3.3V VCC. Some displays offer a bypass resistor to connect directly to the PCB VCC. Keep in mind that the TFT may draw substantial current, so use the built-in regulator if available.

GND: Power - Ground connection.

LED: Power - Back-light LED power; consider a current-limiting resistor.

MISO: Input - Master Input - Slave Output for SPI communication with the Touch IC, SD Card, or FLASH Memory.

MOSI: Output - Master Output - Slave Input for SPI communication with the Touch IC, SD Card, or FLASH Memory.

PEN/T_IRQ: Input - Interrupt request pin from the Touch IC.

F_CS: Output - Chip Select for the Flash Memory IC via SPI communication. Some displays may have flash memory pads but lack the FLASH IC, which can be manually added.

T_CS: Output - Chip Select for the Touch IC via SPI communication. Only some TFT displays include touch support.

CLK: Output - Clock for SPI communication with the Touch IC, SD Card, or FLASH Memory."

Created with the Personal Edition of HelpNDoc: Revolutionize Your CHM Help File Output with HelpNDoc