参数资料
型号: ST92186B3BK
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP32
封装: PLASTIC, SDIP-32
文件页数: 18/148页
文件大小: 1664K
代理商: ST92186B3BK
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ST92186B - 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
register is set, the switch from one row buffer to
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.
7.4.7.9
Handling
the
Row
Buffers
in
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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