M37270MF datasheet(49/95 Pages) RENESAS

49 / 95 page

MITSUBISHI MICROCOMPUTERS

M37270MF-XXXSP

M37270EF-XXXSP, M37270EFSP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

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

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

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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