On-Screen DisplayControlling the Shuttering EffectPanasonic Semiconductor Development Company MN102H75K/F75K/85K/F85K LSI User Manual196Panasonic7.13.2 Controlling Shutter MovementEnabling the shutter movement function in the registers allows the shuttered areato expand or contract over time, producing a wipe-in or wipe-out effect. Thisallows the OSD display to appear or disappear without an abrupt transition. Table7-13 shows the register settings required for this function, and figure 7-32 showsfour setup examples. There is no repeat operation for shutter movement, so youmust reset the bits each time.n Considerations for horizontal shutter movementDo not set the horizontal shutter position (HST0, HST1) within the followingranges if you are only moving the horizontal shutter. The shutter cannot move ifyou 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 MovementFunctionV Shutter 0Bit NameV Shutter 1Bit NameH Shutter 0Bit NameH Shutter 1Bit Name DescriptionShutter movementenable/disableVSM0 VSM1 HSM0 HSM1 0: Move shutter1: Don’t move shutterShuttering movementdirectionVSMP0 VSMP1 HSMP0 HSMP1 0: Move from top to bottom (vertical shutters) orfrom left to right (horizontal shutters)1: Move from bottom to top (vertical shutters) orfrom right to left (horizontal shutters)Shuttering movementspeed controlSHSP0, SHTSP1(shared bits)00:Move every VSYNC01:Move every 2 VSYNCs10:Move every 3 VSYNCs11:Move every 4 VSYNCs
