參數(shù)資料
型號(hào): TVP3010C
廠商: Texas Instruments, Inc.
英文描述: Video Interface Palette
中文描述: 視頻接口面板
文件頁(yè)數(shù): 65/90頁(yè)
文件大?。?/td> 491K
代理商: TVP3010C
2–49
2.16.13 Color-Key (Red, Green, Blue, Overlay) Low and High Registers
These registers are used to specify the color-comparison ranges for the four direct-color data fields when
performing color-key switching. A low and a high register are provided for each of the four data fields to
facilitate the range comparison (see Section 2.6 and subsection 2.6.2 for more details on their usage). All
four low registers are initialized with 01 (hex), while all four high registers are initialized with FF (hex). The
registers may be written to or read from by the MPU at any time. There are eight registers total, two for each
color. The register formats for both low and high registers are shown in Table 2–31.
Table 2–31. Color-Key Low and High Registers
COLOR-KEY LOW
Data Bit
D7
D6
D5
D4
D3
D2
D1
D0
Low Value
L7
L6
L5
L4
L3
L2
L1
L0
Index = 30h, 32h, 34h, and 36h
COLOR-KEY HIGH
Data Bit
D7
D6
D5
D4
D3
D2
D1
D0
High Value
H7
H6
H5
H4
H3
H2
H1
H0
Index = 31h, 33h, 35h, and 37h
Values 00 (hex) to FF (hex) may be written into the four color-key low and four color-key high registers.
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