M37225M6_15 datasheet(67/128 Pages) RENESAS

Part #	M37225M6

Description	SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

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Manufacturer	RENESAS [Renesas Technology Corp]

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67 / 128 page

M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 65 of 124

REJ03B0136-0100Z

(2) 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 (OSC1, main clock from pin

XIN) in the pre-divide circuit.

The dot size is specified by bits 3 and 4 of the block i control register.

Fig. 8.10.15 Block Diagram of Dot Size Control Circuit

Fig. 8.10.16 Definition of Dot Sizes

Refer to Figure 8.10.8 (the block i control register).

The block diagram of dot size control circuit is shown in Figure 8.10.15.

1 dot

1H

Scanning line of F1(F2)

Scanning line of F2(F1)

2H

3H

3TOSC

2TOSC

1TOSC

OSD control circuit

Synchronous

circuit

Horizontal dot size

control circuit

Main clock

XIN

HSYNC

OSC1

OCG0 = “1”

Vertical dot size

control circuit

Clock cycle

= 1TOSC

OCG1 = “0”

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M37225M6 Datasheet(PDF) 67 Page - Renesas Technology Corp

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