Sony SS-HQ1 Application Notes page 155

The mask setting procedure is as follows.
1. Set MSKON to 1h.
2. Set the mask display positions in MSKnHSET, MSKnHRST, MSKnVSET, and MSKnVRST.
3. Set the brightness in MSKYLV and the colors in MSKBYLV and ASKRYLV.
(This parameter is invalid when the 0th hold is being used.)
• 0th hold function
To apply the color at the mask start position of MSKnHSET and MSKnVSET to the entire mask, set the 0th
hold function MSKHLD (CAT9_Byte36_bit3) to ON (1h). Accordingly, during 0th hold execution, the settings
of MSKBYLV, MSKRYLV and MSKYLV are disabled.
Activate 0th hold by setting MSKHLD to 1h.
If there are overlapping masks, the mask with the smaller number is given priority, as shown in the following
figure. In this case, the colors of MASK0 and MASK1 are not subject to the hold function. MASK0 "holds" the
image color under MASK1.
Display area
MSK1HSET
MSK0HSET
MASK1
Fig 10.10-2 0-order Hold Function
MASK start point
MASK0
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- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005