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: 140/148页
文件大小: 1664K
代理商: ST92186B3BK
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ST92186B - ON SCREEN DISPLAY CONTROLLER (OSD)
OSD CONTROLLER (Cont’d)
7.4.5 Programming the Display
The row-wise RAM buffer contains the description
of the characters to display:
– Row and character attributes (color, shape etc.)
– Horizontal shift code
– Character codes (addressing the Font ROM)
While one row buffer is displayed on the screen,
the CPU has time to prepare the content of the
next character row by filling up the second row
buffer. At the time the next row must be displayed,
the Display controller will point to the second row
buffer, allowing the CPU to start loading data into
the first row buffer for the following row. An inter-
rupt request is generated each time the buffer
pointer toggles.
The Vertical location of the next character row on
the screen is programmed by software through the
Event Line value (Refer to Figure 57). The vertical
position of the beam is memorized by the Line
counter which counts the TV horizontal synchroni-
zation pulses (called here "Scan Line"). When the
Scan Line counter matches the Event Line value
the buffer toggle mechanism is activated.
7.4.5.1 OSDRAM Mapping
The OSDRAM is mapped in segment 22h of the
memory space.
In addition to row buffers, it is used to store color
palettes.
Note: The reset value of the OSDRAM contents is
undefined.
General Overview
The Figure 52 gives a general overview of the OS-
DRAM mapping.
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