M37160MF datasheet(78/131 Pages) RENESAS

78 / 131 page

Rev.1.01

2003.11.13

page 78 of 130

M37160M8/MA/MF-XXXSP/FP,M37160EFSP/FP

8.10.13 Window Function

This function sets the top and bottom boundaries for display limits

on a screen. The window function is valid only in the OSD1 mode.

The top boundary is set by the window register 1 and bit 7 of block

control register 1. The bottom boundary is set by window register 1

and bit 7 of block control register 2. This function is turned on and off

by bit 2 of the OSD control register (refer to Figure 8.10.3).

Window registers 1 and 2 are shown in Figures 8.10.27 and 8.10.28.

Fig. 8.10.26 Example of Window Function

8.10.12 Scan mode

The Bi-scan mode corresponds to HSYNC of twice as much frequency

as usual. The vertical display position and the vertical dot size double

compared to the normal scan mode. Scan mode can be set the ver-

tical dot size in bit 0 of OSD control register 2, and the vertical dis-

play start position in bit 1, independently .

Table 8.10.3 Setting of Scan Mode

Bit 0 of OSD control register 2

Item

Scan mode

Normal scan

Bi-scan

Vertical dot size

1TC ✕ 1/2H

1TC ✕ 1H

1TC ✕ 2H

2TC ✕ 2H

2TC ✕ 4H

3TC ✕ 3H

3TC ✕ 6H

Bit 1 of OSD control register 2

Verical display start position

A value of verical position register ✕ 1H

A value of verical position register ✕ 2H

The setting value per one step of the top and bottom window borders

can be switched to either 1TH or 2TH by setting “0” or “1” to bit 1 of

OSD control register 2 (address 02DB16).

OSD2 mode

Window

FG H

OSD1 mode

M N O

OSD1 mode

PQ R

OSD1 mode

OSD2 mode

Bottom

boundary

of window

Top

boundary

of window

Screen

A BCD E

W X

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