Texas Instruments TMS320C6745 DSP - LCD Raster Subpanel Display Register (RASTER_SUBPANEL); LCD Raster Subpanel Display Register (RASTER_SUBPANEL) Field Descriptions

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SPRUH91D–March 2013–Revised September 2016
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Liquid Crystal Display Controller (LCDC)
23.3.12 LCD Raster Subpanel Display Register (RASTER_SUBPANEL)
LCD raster subpanel display register (RASTER_SUBPANEL) displays only the first or last n lines of the
panel and sends a fixed content for the others is supported with the LCD raster subpanel display register.
For these others, there is no access to the frame buffer because the value stored in Default Pixel Data will
be used. The RASTER_SUBPANEL is shown in Figure 23-38 and described in Table 23-23.
If LPPT is greater than the number of lines per panel then:
• If HOLS = 1: normal panel
• If HOLS = 0: panel with default data
LPPT has a minimum value = 2. DPD, LPPT, HOLS, and SPEN bit fields and bits are not considered if
SPEN = 0.
Figure 23-38. LCD Raster Subpanel Display Register (RASTER_SUBPANEL)
31 30 29 28 26 25 16
SPEN Rsvd HOLS Reserved LPPT
R/W-0 R-0 R/W-0 R-0 R/W-0
15 4 3 0
DPD Reserved
R/W-0 R-0
LEGEND: R = Read only; -n = value after reset
Table 23-23. LCD Raster Subpanel Display Register (RASTER_SUBPANEL) Field Descriptions
Bit Field Value Description
31 SPEN Subpanel Enable
0 Disabled
1 Enabled
30 Reserved 0 Reserved
29 HOLS High or Low Signal. The field indicates the position of subpanel compared to the LPPT value.
0 Low, below
1 High, above
28-26 Reserved 0 Reserved
25-16 LPPT 0-3FFh Line Per Panel Threshold. This field defines the number of lines to be refreshed (1 to 1024).
15-4 DPD 0-FFFh Default Pixel Data. DPD defines the default value of the pixel data sent to the panel for the lines until
LPPT is reached or after passing the LPPT.
3-0 Reserved 0 Reserved
23.3.12.1 Default Pixel Data (DPD)
The default pixel data (DPD) defines a default value, which is sent to the display in either the top or
bottom region of the screen delimited by the LPPT threshold.
23.3.12.2 Line-per-Panel Threshold (LPPT)
The line-per-panel threshold bit-field delimits the screen portion filled with data fetched from the frame
buffer (the subpanel) and the rest of the screen filled with default pixel data (DPD). Note that the LPPT
line number points on a line filled with a DPD value when HOLS = 1, but on one filled with video data
when HOLS = 0 (see Figure 23-39 and Figure 23-40).