ST92196A datasheet(151/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

OSD CONTROLLER (Cont’d)

The real time control provides:

– A continuous search of matching values be-

tween Scan line and Event Line (this condition

being evaluated at each TV line start).

– A display interrupt generation when the match

condition is detected.

– In “full OSD mode”, if the TE bit in the OSDER

the second row buffer when the match occurs. If

the TE bit in the OSDER register is reset, when a

matching condition occurs, the previous row buff-

er will be kept.

8.5.8.9

Handling

the

Row

Buffers

Continuous Mode:

– When the line match condition is detected, an in-

terrupt is sent to the CPU.

Let us then assume the TE bit in the OSDER reg-

ister is set. When the interrupt is executed:

– The Event Line value must be programmed to

the next desired value.

– The next Row Buffer content must be filled up by

the data of the next row to display. The next row

buffer is easily identified using the BUFL bit in the

OSDFBR register.

Let us then assume the TE bit in the OSDER reg-

ister is reset. When the interrupt is fetched:

– The Event Line value must be programmed to

the next desired value.

– The Next Row Buffer content might be filled up

by the data of the next row to display, if desired.

– The content of the current Row Buffer is NOT

displayed but simply ignored as it should have al-

ready been displayed in a previous cycle.

Note: In case the TE bit in the OSDER register is

kept reset, there is no need to manage the second

row buffer as it will never be used.

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