LCD Frame Rate (FPS) Calculator

1. Interface Type

SPISingle-line SPI transfers 1 bit per clock cycle

QSPIFour-line QSPI transfers 4 bits per clock cycle

8080-8Bit8-bit 8080 parallel bus transfers 8 bits per clock cycle

8080-16Bit Mux16-bit multiplexed 8080 bus transfers 16 bits per clock cycle

2. Interface Parameters

SCLK (Clock Frequency MHz) Color Depth (BPP)RGB565 (16 bit)RGB666 (18 bit)RGB888 (24 bit)

3. Timing Parameters

Width (pixels)Height (pixels)Single Block (pixels)

Block Wait (ms)FPS Wait (ms)

Data Transfer Flow

StartSingle BlockBlock Wait

Frame sent?

YNFPS Wait

Calculation Formulas

Pixel Clockpixelclk = SCLK × 4 ÷ BPP = 40 × 4 ÷ 16 = 10 MHz

Block Numberblock_num = width × height ÷ block = (800 × 480 ÷ 1) = 384000

Block Periodblock_period = block / pixelclk = 1 / 10000 = 0.0001 ms

FPS Periodfps_period = block_num × (block_period + block_wait) = 384000 × (0.0001 + 0)= 38.4 ms

Periodperiod = fps_period + fps_wait = 38.4 + 0 = 38.4 ms

FPSfps = 1000 ÷ period = 1000 ÷ 38.4 = 26.04

Period38.4ms

Frame Rate (FPS)26.04fps

💡 Tip: Increasing SCLK, using more data lines, or lowering color depth can improve the frame rate. QSPI is 4× faster than SPI, and 8080-16Bit is 2× faster than 8080-8Bit.

Key Factors Affecting Refresh Rate:

1. SPI/QSPI clock frequency: the higher the frequency, the faster the data transfer, but signal integrity must be ensured;
2. Resolution: the higher the resolution, the more data per frame, and the lower the refresh rate;
3. Color depth: RGB565 (16bit) carries 1/3 less data than RGB888 (24bit); RGB565 is recommended for scenarios with high refresh-rate requirements.
4. Since the TR2S chip takes 20-30 ms to push one frame, the theoretical maximum refresh rate is 30 fps.

Typical Reference Values (QSPI mode, 8080_16B mode):

1. TR220S

Chip	Interface	Clock Frequency (MHz)	Resolution	Color Depth	Frame Rate
TR220S	QSPI	80	480×800	RGB565	24
TR220S	8080_16B	40	480×800	RGB565	30

2. TR230S

Chip	Interface	Clock Frequency (MHz)	Resolution	Color Depth	Frame Rate
TR230S	QSPI	100	1024×600	RGB565	22
TR230S	8080_16B	45	1024×600	RGB565	30