M37270MF Datasheet, PDF (69/94 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M37270MF-XXXSP
M37270EF-XXXSP, M37270EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
(13) Scan Mode
M37270MF-XXXSP has the bi-scan mode for corresponding to HSYNC
of double speed frequency. In the bi-scan mode, the vertical start
display position and the vertical size is two times as compared with
the normal scan mode. The scan mode is selected by bit 1 of the
OSD control register (refer to Figure 49).
Table 19. Setting for scan mode
Parameter
Bit 1 of OSD control register
Vertical display start position
Vertical dot size
Scan mode
Normal scan
0
Value of vertical position register ! 1H
1TC ! 1/2H
1TC ! 1H
2TC ! 2H
3TC ! 3H
Bi-scan
1
Value of vertical position register ! 2H
1TC ! 1H
1TC ! 2H
2TC ! 4H
3TC ! 6H
(14) Window Function
This function sets the top and bottom boundary of display limit on a
screen. The window function is valid only in the CC mode. The top
boundary is set by the window H registers 1 and 2. The bottom bound-
ary is set by the window L registers 1 and 2. This function is turned
on and off by bit 5 of the OSD control register (refer to Figure 49).
The structure of the window H registers 1 and 2 is shown in Figure
78, the structure of the window L registers 1 and 2 is shown in Figure
79.
Notes 1: Set values except “0016” and “0116” to the window H regis-
ter 1 when the window H register 2 is “0016.”
2: Set the register value fit for the following condition :
(WH1 + WH2) < (WL1 + WL2)
ABC DE
F GH I J
K L MNO
P QR S T
U V WX Y
EXOSD mode
CC mode
CC mode
CC mode
OSD mode
Screen
Top
boundary
of window
Window
Bottom
boundary
of window
Fig. 77. Example of window function
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