M37225M6_15 datasheet(79/128 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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79 / 128 page

M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 77 of 124

REJ03B0136-0100Z

(9) Window function

The window function can be set windows on-screen, and output OSD

within only the area where the window is set.

The ON/OFF for vertical window function is performed by bit 4 of the

OSD control register. The top boundary is set by the top border con-

trol register (TBR) and the bottom boundary is set by bottom border

control register (BBR). The left boundary is set by the left border

control register (LBR), and the right boundary is set by the right bor-

der control register (RBR).

The left and right boundarys can be adjusted minutely by bits 2 and 3

of the OSD control register (address 00EA16).

Note: The SPRITE display is not effected by the window function.

Fig. 8.10.27 Example of window function

Window

FG H

I

J

KL

M N O

PQ R

S

T

Bottom boundary

of window

Top boundary

of window

Screen

Window

Right boundary

of window

4TOSC ✕ RBR + 1TOSC ✕ WH

4TOSC ✕ LBR + 1TOSC ✕ WH

Tdef4

HSYNC

Hdef

TBR

BBR

VSYNC

LBR : Value of left border control register

RBR : Value of right border control register

WH

: Value (0 to 3) of window horizontal position minute adjustment bit

TOSC : OSD oscillation cycle

Tdef4 : 4TOSC

TBR : Value of top border control register

BBR : Value of bottom border control register

Hdef

: 17H

H

: HSYNC

Left boundary

of window

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