STV9937 datasheet(16/49 Pages) STMICROELECTRONICS

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Window Specifications

STV9937

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3.4

Window Size: Number of Character Rows and Character Columns

3.4.1

Window Horizontal Size

The window horizontal size defines the number of characters displayed for character row for each

separate OSD window. This value is selected by bits HSW1[4:0], HSW2[4:0], HSW3[4:0] and

HSW4[4:0], respectively.

The range of the window horizontal size is from 1 to 32 characters, in steps of 1 character each.

Each character is 12 pixels long. There is an offset of 1 character.

Window Horizontal Size = HSWi[4:0] +1 characters

The default values for the window horizontal size for each of the four OSD windows is given in

Table 10.

3.4.2

Window Vertical Size

The window vertical size defines the number of character rows displayed for each separate OSD

window. This value is selected by bits VSW1[3:0], VSW2[3:0], VSW3[3:0] and VSW4[3:0],

respectively.

The range of the window vertical size is from 1 to 16 character rows, in steps of 1 character row

each. It is important to note that the height of each character row is defined by the row height

parameter. For more information, refer to Section 4.4: Space Lines on page 21. There is an offset of

1 character row.

Window Vertical Size = (VSWi[3:0] + 1) x Row_Height (in scan lines)

Row_Height = Character_Height + 2 x Space_Lines

The default values for the window vertical size for each of the four OSD windows is given in

Table 11.

Table 12 shows an example of the origin and size of windows based on the example shown in

Figure 8,

Table 10: Window Horizontal Size

FWR

FAC

Default

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

80h

0Eh, 13h,

18h, 1Dh

19h, 9h,

Fh, Fh

HSWi[4:0]

Table 11: Window Vertical Size

FWR

FAC

Default

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

80h

0Fh, 14h,

19h, 1Eh

Bh, 4h,

7h, 7h

VSWi[3:0]

Table 12: Example of Origin and Size of Windows

Window i

HSWi

VSWi

Window 1

0274

Window 2

5045

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