STV9936S datasheet(13/48 Pages) STMICROELECTRONICS

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STV9936P/S

Window Specifications

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 vertical 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]. A general horizontal offset is also

applied:

General Horizontal Offset = 50 pixels

− Phase Error Detection Pulse Width (in pixels)

The range of the horizontal delay is from 50 to 812 pixels, in steps of 6 pixels each.

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

The default value 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.

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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