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On-Screen Display
Controlling the Shuttering Effect
MN102H75K/F75K/85K/F85K LSI User Manual Panasonic Semiconductor Development Company
199
Panasonic
■ To shutter the color background:
Set the color background shutter control bit, COLBSHT, of the shutter control
register, SHTC (x’007F28’) to 1.
This function exists only when the program enables a color background. It allows
you to limit the area covered by the color background.
■
To blank out the shuttered area:
Set the shutter blanking control bit, SHTBLK, of SHTC to 1.
Shutter blanking outputs black to the entire shuttered area. To output blanking to
a display that uses a color background, enable the color background shutter
(COLBSHT = 1) so that the color background will also be blanked in the
shuttered area. Figure 7-34 shows two setup examples.
Figure 7-33 Text-Layer Shuttering Setup Examples
Television screen
CCSHT = 0: Shuttering of text foreground disabled
BCSHT = 0: Shuttering of text background disabled
VSHT1
VSHT0
Shuttered region
HSHT0
HSHT1
ABCDE
Television screen
CCSHT = 1: Shuttering of text foreground enabled
BCSHT = 0: Shuttering of text background disabled
VSHT1
VSHT0
HSHT0
HSHT1
CDE
Television screen
CCSHT = 0: Shuttering of text foreground disabled
BCSHT = 1: Shuttering of text background enabled
VSHT1
VSHT0
HSHT0
HSHT1
ABCDE
The text background disappears, leaving only
the characters visible.