M37281EKSP Datasheet, PDF (107/172 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

M37281MAH–XXXSP,M37281MFH–XXXSP,M37281MKH–XXXSP, M37281EKSP
8.11.14 Window Function
The window function can be set windows on-screen, and output OSD
within only the area where the window is set.
The ON/OFF for vertical window function is performed by bit 5 of
OSD control register 1 and is used to select vertical window function
or vertical blank function by bit 6 of OSD control register 2. Accord-
ingly, the vertical window function cannot be used simultaneously
with the vertical blank function. The display mode to validate the win-
dow function is selected by bits 5 to 7 of OSD control register 3. The
top boundary is set by top border control registers 1, 2 (TB1, TB2)
and the bottom boundary is set by bottom border control registers 1,
2 (BB1, BB2).
The ON/OFF for horizontal window function is performed by bit 4 of
OSD control register 2 and is used interchangeably for the horizontal
blank function with bit 5 of OSD control register 2. Accordingly, the
horizontal blank function cannot be used simultaneously with the
horizontal window function. The display mode to validate the window
function is selected by bits 5 to 7 of OSD control register 3. The left
boundary is set by left border control registers 1, 2 (LB1, LB2), and
the right boundary is set by right border control registers 1, 2 (RB1,
RB2).
Notes 1: Horizontal blank and horizontal window, as well as vertical blank and
vertical window can not be used simultaneously.
2: When the window function is ON by OSD control registers 1 and 2,
the window function of OUT2 is valid in all display mode regardless
of setting value of OSD control register 3 (bits 5 to 7). For example,
even when make the window function valid in only CC mode, the
function of OUT2 is valid in OSD and CDOSD modes.
3: The SPRITE display is not effected by the window function.
Left boundary
of window
Window
Right boundary
of window
ABCDE
F GH I J
K L MNO
P QRS T
U V WX Y
Screen
CDOSD mode
CC mode
OSD mode
Top boundary
of window
Window
Bottom boundary
of window
Fig. 8.11.44 Example of window function (When CC Mode Is Valid)
Rev.1.01 2003.07.16 page 107 of 170