Table 4. Minimum Usable Fsmc Address Bit Depending On Image Size (16 Bit Rgb565 Access); Figure 4. Automatic Control Of Lcd-Tft Display Data/Command By Fsmc Interface - ST STM32L496 Series Application Note

LCD-TFT display on FSMC
Figure 4.
FSMC_D[15:0]
1. 'x' as high as possible according
For example, if the image buffer size is 240x240 pixels and the transfer is done using 16 bits
in RGB565 mode (one pixel transferred per access to LCD), the number of accesses are
240x240 = 57600 accesses and the FSMC address increments from 0x0000 0000 to
0x0000 E0FF.
Thus the 1
In this specific case the FSMC_A16 or a higher address bit can be used.
Table 4 shows the minimum FSMC address bit that can be used depending on some image
size.
Table 4. Minimum usable FSMC address bit depending on image size (16 bit RGB565
Image size
VGA
HVGA
QVGA
-
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Automatic control of LCD-TFT display data/command by FSMC interface
(1)
FSMC_A[x]
Table
st
address bit that does not change during the transfer is the bit 16.
Nb of pixels
640x480
480x320
320x240
240x240
DocID029937 Rev 2
LCD-TFT display
Data[15:0]
Data/command selection
Other control signals
4.
access)
Nb of accesses Max address
307200 0x4AFFF
153600 0x257FF
76800 0x12BFF
57600 0x0E0FF
AN4943
MSv44237V1
Min usable FSMC
address bit
FSMC_A19
FSMC_A18
FSMC_A17
FSMC_A16