M37274EFSP datasheet(74/148 Pages) RENESAS

74 / 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

Notes 1 : 1TC (TC : OSD clock cycle divided by prescaler) gap oc-

curs between the horizontal display start position set by

the horizontal position register and the most left dot of the

1st block. Accordingly, when 2 blocks have different pre-

divide ratios, their horizontal display start position will not

match.

Ordinaly, this gap is 1TC regardless of character sizes,

however, the gap is 1.5TC only when the character size is

1.5TC.

2 : The horizontal start position is based on the OSD clock

source cycle selected for each block. Accordingly, when 2

blocks have different OSD clock source cycles, their hori-

zontal display start position will not match.

Fig. 73. Notes on Horizontal Display Start Position

HSYNC

1TC

Block 1 (Pre-divide ratio = 1, clock source = data slicer clock)

1TC

4TOSC ! N

4TOSC’ ! N

Note 1

Note 2

Block 2 (Pre-divide ratio = 2, clock source = data slicer clock)

Block 3 (Pre-divide ratio = 3, clock source = data slicer clock)

Block 5 (Pre-divide ratio = 3, clock source = OSC1)

Block 4 (Pre-divide ratio = 2, character size = 1.5Tc, clock source = data slicer clock)

1.5TC

: Value of horizontal position register (decimal notation)

: OSD clock cycle divided in the pre-divide circuit

: OSD oscillation cycle

1Tc

Tosc

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