M37281EKSP Datasheet, PDF (108/172 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
8.11.15 Blank Function
The blank function can output blank (OUT1) area on all sides (verti-
cal and horizontal) of the screen.
The ON/OFF for vertical blank function is performed by bit 5 of the
OSD control register 1 and is used to select vertical window function
or vertical blank function by bit 6 of the OSD control register 2. Ac-
cordingly, the vertical blank function cannot be used simultaneously
with the vertical window function. The top border is set by the top
border control registers 1, 2 (TB1, TB2) and the bottom border is set
by the bottom border control registers 1, 2 (BB1, BB2), in 1H units.
The ON/OFF for horizontal blank function is performed by bit 4 of the
OSD control register 2 and is used interchangeably for the horizontal
window function with bit 5 of the OSD control register 2 . Accordingly,
the horizontal blank function cannot be used simultaneously with the
horizontal window function. The left border is set by the left border
control registers 1, 2 (LB1, LB2) and the right border is set by the
right border control registers 1, 2 (RB1, RB2), in 1TOSC units.
The OSD output (except raster) in area with blank output is not de-
leted.
These blank signals are not output in the horizontal/vertical blanking
interval.
Notes 1: Horizontal blank and horizontal window, as well as vertical blank
and vertical window cannot be used simultaneously.
2: When all-blocks display is OFF (bit 0 of OSD control register 1 = “0”),
do not use vertical blank.
A
4 ^A'
H
OUT1
L
H
B
L
Blank output
H
signal in
microcomputer
L
Output example of horizontal blank
A
4
Blank output
signal in
OUT1 B microcomputer
A'
LHL H LH
Output example of top and vertical blank
Fig. 8.11.45 Blank Output Example (When OSD Output is B + OUT1)
Rev.1.01 2003.07.16 page 108 of 170