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: 8/148页
文件大小: 1664K
代理商: ST92186B3BK
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ST92186B - ON SCREEN DISPLAY CONTROLLER (OSD)
OSD CONTROLLER (Cont’d)
7.4.7.2 Horizontal Shift and Row Character Count
Address in Segment 22h: 2p + 2 (Bits 15:8), 2p + 3 (Bits 7:0). See Figure 52.
For each row to be displayed, the number of char-
acters in the row, and the horizontal position of the
row on the screen need to be specified.
Let’s assume that the start address of the current
row buffer is 2p (even address).
Bits 15:10 = RCN[5:0]
Row Character Count
These bits define the number of characters to dis-
play in the current row.
The Display controller allows to display from 1 to
63 characters (in parallel mode) or 61 (in serial
mode, as the first 2 bytes are taken as attributes)..
For example, a 36 character row requires pro-
gramming RCN[5:0] = 24h.
Bits 9:0 = HS[9:0]
Horizontal Shift
These bits define the horizontal shift value. They
specify, in terms of number of Pixel clock periods,
the horizontal shift applied from the leading edge
of the Hsync pulse to the beginning of the first dis-
played character (1st character in parallel modes,
3rd character in serial mode). Refer to Figure 57.
Loading any value smaller than 01h is forbidden.
The result is given by the formula:
Horizontal shift = [HS[9:0]+ 47] * (2*PIXCLK)
(where PIXCLK is the clock issued from the Skew
Corrector). Refer to the Timing and Clock Control
chapter for programming information.
Figure 57. Row Position
15
8
7
0
RCN5
RCN4
RCN3
RCN2
RCN1
RCN0
HS9
HS8
HS7
HS6
HS5
HS4
HS3
HS2
HS1
HS0
Displayed Row
Event Line (Vertical Shift)
Horizontal
Shift
ST92186
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