Renesas PCA7400 Bedienungsanleitung PDF herunterladen (Seite 73)

MITSUBISHI MICROCOMPUTERS

M37271MF-XXXSP

M37271EF-XXXSP, M37271EFSP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

(13) Scan Mode

M37271MF-XXXSP has the bi-scan mode for corresponding to HSYNC

of double speed frequency. In the bi-scan mode, the vertical start

display position and the vertical size is two times as compared with

the normal scan mode. The scan mode is selected by bit 1 of the

OSD control register (refer to Figure 52).

(14) Window Function

This function sets the top and bottom boundary of display limit on a

screen. The window function is valid only in the CC mode. The top

boundary is set by the window H registers 1 and 2. The bottom bound-

ary is set by the window L registers 1 and 2. This function is turned

on and off by bit 5 of the OSD control register (refer to Figure 52).

The structure of the window H registers 1 and 2 is shown in Figure

81, the structure of the window L registers 1 and 2 is shown in Figure

82.

Notes 1: Set values except “0016” and “0116” to the window H regis-

ter 1 when the window H register 2 is “0016.”

2: Set the register value fit for the following condition :

(WH1 + WH2) < (WL1 + WL2)

Bit 1 of OSD control register

Vertical display start position

Vertical dot size

Table 19. Setting for scan mode

Normal scan

Value of vertical position register ✕ 1H

1TC ✕ 1/2H

1TC ✕ 1H

2TC ✕ 2H

3TC ✕ 3H

Bi-scan

Value of vertical position register ✕ 2H

1TC ✕ 1H

1TC ✕ 2H

2TC ✕ 4H

3TC ✕ 6H

Scan mode

Parameter

Fig. 80. Example of window function

EXOSD mode

Window

FGHI J

CC mode

KLMNO

CC mode

PQRST

CC mode

OSD mode

Bottom

boundary

of window

Top

boundary

of window

Screen

ABCDE

UVWXY

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 97 98

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