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Controlling the Shuttering Effect
Panasonic Semiconductor Development Company MN102H75K/F75K/85K/F85K LSI User Manual
196
Panasonic
7.13.2 Controlling Shutter Movement
Enabling the shutter movement function in the registers allows the shuttered area
to expand or contract over time, producing a wipe-in or wipe-out effect. This
allows the OSD display to appear or disappear without an abrupt transition. Table
7-13 shows the register settings required for this function, and figure 7-32 shows
four setup examples. There is no repeat operation for shutter movement, so you
must reset the bits each time.
■
Considerations for horizontal shutter movement
Do not set the horizontal shutter position (HST0, HST1) within the following
ranges if you are only moving the horizontal shutter. The shutter cannot move if
you do.
x’000’ to x’003’ and x’3FC’ to x’3FF’
You can set these values if you wish to prevent horizontal shutter movement.
Note that the horizontal shutter position does not affect vertical movement.
Table 7-13 Bit Settings for Controlling Shutter Movement
Function
V Shutter 0
Bit Name
V Shutter 1
Bit Name
H Shutter 0
Bit Name
H Shutter 1
Bit Name Description
Shutter movement
enable/disable
VSM0 VSM1 HSM0 HSM1 0: Move shutter
1: Don’t move shutter
Shuttering movement
direction
VSMP0 VSMP1 HSMP0 HSMP1 0: Move from top to bottom (vertical shutters) or
from left to right (horizontal shutters)
1: Move from bottom to top (vertical shutters) or
from right to left (horizontal shutters)
Shuttering movement
speed control
SHSP0, SHTSP1
(shared bits)
00:Move every VSYNC
01:Move every 2 VSYNCs
10:Move every 3 VSYNCs
11:Move every 4 VSYNCs