M37274EFSP datasheet(45/148 Pages) RENESAS

45 / 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

Fig. 39. Caption Position Register

(6) Reference Voltage Generating Circuit and

Comparator

The composite video signal clamped by the clamping circuit is input

to the reference voltage generating circuit and the comparator.

Reference voltage generating circuit

This circuit generates a reference voltage (slice voltage) by using

the amplitude of the clock run-in pulse in line specified by the data

Line

Line specified by bits 4 to 0 of CP

(Main data slice line)

Line specified by bits 7 to 3 of DSC3

(Sub-data slice line)

DSC1 : Data slice control register 1

DSC3 : Data slice control register 3

CP : Caption position register

Field

Field specified by bit 1 of DSC1

0: F2

1: F1

Field specified by bit 1 of DSC3

0: F2

1: F1

Bit 0 of DSC3

slice line specification circuit. Connect a capacitor between the

VHOLD pin and the VSS pin, and make the length of wiring as short

as possible so that a leakage current may not be generated.

Comparator

The comparator compares the voltage of the composite video signal

with the voltage (reference voltage) generated in the reference

voltage generating circuit, and converts the composite video signal

into a digital value.

b7 b6 b5 b4 b3 b2 b1 b0

Caption Position Register (CP) [Address 00E0 16]

Caption Position Register

0R W

Specification main data

slice line (CP0 to CP4)

Fix this bit to “0.”

5, 6 Fix these bits to “0.”

After reset

Functions

Name

0R W

Table 4. Specifying of Field Whose Sets Reference Voltage

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