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: 7/148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 Programming the Row Buffers
The 2 row buffers are based on the same structure
(Figure 52):
– Next Buffer Start Address
– Row Mode
– Horizontal Shift
– Row Character Count
7.4.7.1 Next Buffer Start Address And Row Mode
Address in Segment 22h: 2p (Bits 15:8), 2p + 1 (Bits 7:0). See Figure 52.
To display more than 1 character row on the
screen, you must specify the start address of the
next OSDRAM row buffer (the row buffer contain-
ing the next row to be displayed when the current
row is completely processed). Two bytes are re-
served for this in the OSDRAM. (See Figure 52).
As it is possible to display each row using different
modes (serial, basic parallel, and extended paral-
lel), the row mode has to be specified for the cur-
rent row buffer.
Bits 15:14 = WM[2:1]
Serial/parallel Row Mode
control
These bits define the row mode for the buffer de-
fined by the Next Buffer Start Address (NSA[8:0]
bits). Refer to Table 19 for details.
Table 19. Serial/Parallel mode control
Bits 13:9 = Free for the user
Bits 8:0 = NSA[8:0]
Next buffer Start Address
These bits define the start address of the next row
buffer.
As row buffer start addresses are always even ad-
dresses, the NSA0 is not implemented, and Bit 0 is
forced to 0 by hardware.
15
8
7
0
WM2
WM1
NSA8 NSA7
NSA6
NSA5
NSA4
NSA3
NSA2
NSA1
0
WM2
WM1
Mode
1
(reserved)
1
0
Extended Parallel
0
1
Basic Parallel
0
Serial
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