M37270MF Datasheet, PDF (48/94 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
(1) Dual Layer OSD
M37270MF-XXXSP has 2 layers; layer 1 and layer 2. These layers
display the OSD for controlling TV and the closed caption display at
the same time and overlayed on each other.
Each block can be assigned to either layer by bits 6 and 5 of the
block control register (refer to Figure 50). For example, only when
both bits 5 and 6 are “1,” the block is assigned to layer 2. Other bit
combinations assign the block to layer 1.
When a block of layer 1 is overlapped with that of layer 2, a screen is
combined (refer to Figure 52) by bits 7 and 6 of the OSD control
register (refer to Figure 49).
Note: When using the dual layer OSD, note Table 12.
Layer 2
Block 13
Block 14
Block 15
Block 16
Block
Block 1
Block 2
Block 11
Block 12
Block
Layer 1
Fig. 51. Image of dual layer OSD
Table 12. Conditions of dual layer
Parameter
Block
Block in layer 1
Block in layer 2
Display mode
CC mode
OSD mode
OSD Clock source
Pre-divide ratio
Data slicer clock or OSC1
! 1 or ! 2 (all blocks)
Same as layer 1
Same as layer 1 (Note)
Dot size
1TC ! 1/2H
Pre-divide ratio = 1
1TC ! 1/2H
1TC ! 1H
Pre-divide ratio = 2
1TC ! 1/2H, 1.5TC ! 1/2H
1TC ! 1H, 1.5TC ! 1H
Horizontal display start position
Arbitrary
Same position as layer 1
Note: For the pre-divide ratio of the layer 2, select the same as the layer 1’s ratio by bit 6 of the clock control register.
Display example of layer 1 = “HELLO,” layer 2 = “CH5”
HELL^CO^H5
HELLO^CH5
HELL^CO^H5
Logical sum (OR) of
layer 1’s color and
layer 2’s color
Bit 7 = “0,” bit 6 = “0”
Layer 1’s color has priority Layer 2’s color has priority
Bit 7 = “0”, bit 6 = “1”
Bit 7 = “1,” bit 6 = “0”
Fig. 52. Display example of dual layer OSD
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