MITSUBISHI MICROCOMPUTERS
M37270MF-XXXSP
M37270EF-XXXSP, M37270EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
48
OSD mode
Same as layer 1
Same as layer 1 (Note)
Pre-divide ratio = 1 Pre-divide ratio = 2
1TC ✕ 1/2H 1TC ✕ 1/2H, 1.5TC ✕ 1/2H
1TC ✕ 1H 1TC ✕ 1H, 1.5TC ✕ 1H
Same position as layer 1
(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.
Fig. 51. Image of dual layer OSD
CC mode
Data slicer clock or OSC1
✕ 1 or ✕ 2 (all blocks)
1TC ✕ 1/2H
Arbitrary
Display mode
OSD Clock source
Pre-divide ratio
Dot size
Horizontal display start position
Table 12. Conditions of dual layer
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.
Block in layer 1 Block in layer 2
Fig. 52. Display example of dual layer OSD
Layer 2
Layer 1
Block 1
Block 2
Block 11
Block 12
...
Block 13
Block 14
Block 15
Block 16
Block
Block
Display example of layer 1 = “HELLO,” layer 2 = “CH5”
CH5
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
Bit 7 = “0”, bit 6 = “1”
CH5
HELLO
Layer 2’s color has priority
Bit 7 = “1,” bit 6 = “0”
HELLO
CH5
Block
Parameter
HELLO
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