M37274EFSP datasheet(75/148 Pages) RENESAS

75 / 148 page

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

and ON-SCREEN DISPLAY CONTROLLER

M37274EFSP

PRELIMINARY

Notice:

This

is not

a final

specification.

Some

paramentic

limits

are

subject

to change.

MITSUBISHI MICROCOMPUTERS

(3) Dot Size

The dot size can be selected by a block unit. The dot size in vertical

direction is determined by dividing HSYNC in the vertical dot size con-

trol circuit. The dot size in horizontal is determined by dividing the

following clock in the horizontal dot size control circuit : the clock

gained by dividing the OSD clock source (data slicer clock, OSC1,

main clock) in the pre-divide circuit. The clock cycle divided in the

pre-divide circuit is defined as 1TC.

The dot size of the layer 1 is specified by bits 6 to 3 of the block

control register.

The dot size of the layer 2 is specified by the following bits : bits 3

and 4 of the block control register, bit 6 of the clock source control

ter), refer to Figure 76 (the structure of the clock source control reg-

ister).

The block diagram of dot size control circuit is shown in Figure 75.

Notes 1 : The pre-divide ratio = 3 cannot be used in the CC mode.

2 : The pre-divide ratio of the OSD mode block on the layer 2

must be same as that of the CC mode block on the layer 1

by bit 6 of the clock source control register.

3 : In the bi-scan mode, the dot size in the vertical direction is

2 times as compared with the normal mode. Refer to “(13)

Scan Mode” about the scan mode.

Fig. 74. Block Diagram of Dot Size Control Circuit

Fig. 75. Definition of Dot Sizes

In normal scan mode

HSYNC

Main clock

Synchronous

Cycle ! 2

circuit

Cycle ! 3

Pre-divide circuit

Clock cycle

= 1TC

Horizontal dot size

control circuit

Vertical dot size

control circuit

OSD control circuit

Data slicer

clock

(Note)

OSC1

Note: To use data slicer clock, set bit 0 of data slicer control register to “0.”

1 dot

Scanning line of F1(F2)

Scanning line of F2(F1)

1/2H

3TC

2TC

1TC

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