ST92196A datasheet(122/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

8.5.3.12 Mouse Pointer

The Mouse Pointer icon is built as an 18x26 dot

matrix; it is fully user definable, selected from any

of the OSD characters in Font ROM memory (ex-

cept 00h). This allows a multiple mouse configura-

tion.

The Mouse Pointer dots are processed like any

9x13 character, i.e. any dot is displayed on both

fields and represents a final 2x2 pixel area on the

screen. The Mouse Pointer represents a 18x26

character displayed in 2Y-2X size.

Only the Mouse Pointer foreground is displayed.

The Mouse Pointer background is transparent.

The Mouse Pointer dot processing includes the

standard foreground pixel processing and also the

rounding and fringe. The algorithms used are the

same as for characters (for more details, refer to

the rounding and fringe section above, assuming a

9x13 character matrix case extended to an 18x26

matrix).

The Mouse Pointer uses one of the foreground

Palette entries to define its pixel color. All features

of the foreground Palette are retained except the

Underline.

The priority of all color layers is from highest-to-

lowest:

Mouse foreground, Mouse fringe, OSD characters

and border.

8.5.4 Horizontal and Vertical Sync

8.5.4.1 Pixel Clock Control

The Pixel clock is issued from a frequency multipli-

er which is locked to the main crystal frequency.

The synthesized frequency is software program-

mable (4-bit value defining the multiplying factor)

which provides flexibility for supporting various ap-

plication conditions, from a basic 4/3 screen for-

mat and a “1H” horizontal sweep to a 16/9 format

with a “2H” sweep, interlaced or progressive scan-

ning. For more information, refer to the Timing and

Clock Controller chapter.

Note: It is recommended to wait for a stable clock

(approx. 35 ms) from the frequency multiplier be-

fore enabling the OSDRAM controller.

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