STV9937 datasheet(14/49 Pages) STMICROELECTRONICS

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Window Specifications

STV9937

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3.1

Enable Display

The Enable Display command for each window is selected by bits ENW1, ENW2, ENW3 and

ENW4. If the ENWi bit is set to 1, the corresponding window is displayed.

3.2

Origin Positions for the 4 Windows

The 4 windows are arranged in a frame whose origin coordinates are the horizontal delay (HD) and

the vertical delay (VD) located at the upper left-hand corner of the monitor screen. When the HD

and VD values are changed, the 4 windows within the frame position are automatically shifted by

the same value. The origin (HD, VD) can be programmed anywhere on the screen. Adjusting the

origin position is used to globally reposition the OSD windows.

The advantages of this system are easier programming, the possibility to adapt the position of all

windows at a single time without changing the relative position of each window and the possibility

for the user to program all 4 window positions.

3.2.1

General Horizontal Delay (HD)

The general horizontal delay defines the horizontal position of the origin coordinate for all four OSD

windows. The horizontal delay is selected by bits HD[6:0].

General Horizontal Offset = 50 pixels

General Horizontal Delay = HD[6:0] x 6 pixels + General Offset (in pixels)

The default value of the horizontal delay is 0h (left-hand side of the monitor screen).

3.2.2

General Vertical Delay (VD)

The general vertical delay defines the vertical position of the origin coordinate for all four OSD

windows. The vertical delay is selected by bits VD[7:0]. A general vertical offset of 2 scan lines is

also applied.

The range of the vertical delay is from 2 to 1022 scan lines, in steps of 4 scan lines each.

General Vertical Delay = VD[7:0] x 4 + 2 (in scan lines)

The default value of the vertical delay is 0h (top of screen).

Table 5: Enable Display

FWR

FAC

Default

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

80h

07h

ENW4

ENW3

ENW2

ENW1

Table 6: Origin of Windows on Horizontal Axis: Horizontal Delay

FWR

FAC

Default

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

80h

04h

HD[6:0]

Table 7: Origin of Windows on Vertical Axis: Vertical Delay

FWR

FAC

Default

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

80h

05h

VD[7:0]

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