GigaDevice Semiconductor GD32F20 Series, User Manual

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GD32F20x User Manual
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23. TFT-LCD interface (TLI)
23.1. Overview
The TLI (TFT-LCD Interface) module handles the synchronous LCD interface and provides
pixel data, clock and timing signals for passive LCD display. It supports a wide variety of
displays with fully programmable timing parameters. A built-in DMA engine continuously move
data from system memory to TLI and then, output to an external LCD display. Two separate
layers are supported in TLI, as well as layer window and blending function.
23.2. Characteristics

Supports up to 24 bits data output per pixel

Supports up to 800 x 600 resolution

Timing parameters is fully programmable

Built-in DMA engine to handle frame data copy

2 separate frame layers with window and blending function

Support various pixel formats: ARGB8888, RGB888, RGB565, etc

Support CLUT (Color Look-Up-Table) and Color-Keying format

Dithering operation to low bits of a pixel
23.3. Block diagram
Figure below shows the block diagram of the TLI module. There are three clock domains in
TLI. The register works in APB clock and is visited by system APB bus. The Pixel DMA module
works in AHB clock and fetches pixel data from system memory using AHB bus. The
remaining modules work in TLI clock. The TLI clock is configured by PLLTSEL, PLLTPSC,
PLLTMF, PLLTRPSC and TLIPSC, refer to PLLT configuration register (RCU_PLLTCFG)
in RCU module.