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Do not allow the horizontal shut-
tering boundaries to overlap any
italicized portion of a closed-
caption display. This distorts the
italicized characters.
Panasonic Semiconductor Development Company
7.13.3 Controlling Shuttering Effects
Through register settings, you can independently control shuttering for text, text
background, graphics, and color background. You can also output blanks to the
shuttered area.
You cannot shutter the cursor layer.
Table 7-13 shows the register settings required for these effects. There are three
types of shuttering—shuttering of text, text background, and graphics, shuttering
of the color background, and shutter blanking. The sections below describe how
to control each of these.
Table 7-14 Bit Settings for Controlling Shuttering Effects
Function
Bit Name
Text shuttering
CCSHT
Text background
BCSHT
shuttering
Graphics shuttering
GSHT
Color background
COLBSHT
shuttering
Shutter blanking
SHTBLK
To shutter text-layer characters, text-layer background, and graphics layer:
Text
Set the text shutter control bit, CCSHT, of the shutter control register, SHTC
(x'007F28') to 1.
Text background
Set the text background shutter control bit, BCSHT, of SHTC to 1.
Graphics
Set the text background shutter control bit, GSHT, of SHTC to 1.
Figure 7-33 shows three setup examples of text-layer shuttering.
198
Panasonic
On-Screen Display
Controlling the Shuttering Effect
Description
0: Shutter text-layer characters
1: Don't shutter text-layer characters
0: Shutter text-layer background
1: Don't shutter text-layer background
0: Shutter graphics layer
1: Don't shutter graphics layer
0: Shutter color background
1: Don't shutter color background
0: Don't output blanks to the shuttered area
1: Output blanks to the shuttered area
MN102H75K/F75K/85K/F85K LSI User Manual
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