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参数资料
| 型号： | LM1253AAE/NA |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 画面叠加 |
| 英文描述： | ON-SCREEN DISPLAY IC, PDIP28 |
| 封装： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件页数： | 26/61页 |
| 文件大小： | 1671K |
| 代理商： | LM1253AAE/NA |
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Four-Color Attribute Table (Continued)
TABLE 8. Four-Color Attribute Registers (Continued)
LM1253A Four-Color Attribute Registers
Register
Address
D7
D6
D5
D4
D3
D2
D1
D0
ATT4C3n
+3
XXXXXXXX
ATT4C4n
+4
C3B[1:0]
C3G[2:0]
C3R[2:0]
ATT4C5n
+5
C4B[0]
C4G[2:0]
C4R[2:0]
C3B[2]
ATT4C6n
+6
XXXXXX
C4B[2:1]
ATT4C7n
+7
XXXXXXXX
Note: Set Reserved bits to 0.
Four-color display character Attribute Table. The attributes for four-color display characters may be written or read via the
following address format:
A15–A7: Always 1000_0101_0b
A6–A3: Attribute value (0h–Fh are valid values), n
A2–A0: Determine which of the six bytes of the attribute is to be accessed.
NOTE: In the table, n indicates the attribute number, 0< =n< =15
NOTE: When writing, bytes 0 to 2 must be written, in that order and bytes 4 to 6 must be written, in that order.
Bytes 0 through 2 will take effect after byte 2 is written. Bytes 4 through 6 will take effect after byte 6 is written.
Since bytes 5 and 7 contain all reserved bits, these bytes may be written, but no effect will result. When reading, it is OK to read
only one, two, or all three bytes.
If writing more than one 4-color attributes using the auto increment feature, all eight bytes must be written.
Display Page RAM
The OSD Window
The Display Page RAM contains all of the 8 bit display character codes and their associated 4 bit attribute codes, and the special
12 bit page control codes — the row-end, skip-line parameters and window-end characters.
The LM1253A has a distinct advantage over many OSD generators that it allows variable size and format windows. The window
size is not dictated by a fixed geometry area of RAM. Instead, 512 locations of 12 bit words are allocated in RAM for the definition
of the windows, with special control codes to define the window size and shape.
Window width can be any length supported by the number of pixels per line that is selected divided by the number of pixels in a
character line. It must be remembered that OSD characters displayed during the monitor blanking time will not be displayed on
the screen, so the practical limit to the number of horizontal characters on a line is reduced by the number of characters within
the horizontal blanking period.
Character Code And Attribute Code
Each of the 512 x 12 bit locations in the page RAM is comprised of an 8 bit character or control code, and a 4 bit attribute code:
Bits 11–4 Character Code: These 8 bits define which of the 254 characters is to be called from the character ROM. Valid
character codes are 02h–FFh.
Bits 3–0:
Attribute code. These 4 bits address the attribute table used to specify which of the 16 locations in RAM specify the
colors and enhanced features to be used for this particular character. Two separate attribute tables are used, one for
2-color characters, the other for 4-color characters.
Each of the characters are stored in sequence in the page RAM. Special codes are used between lines to show where one line
ends and the next begins, and also to allow blank (or ‘skipped’) lines to be added between character rows.
DS101265-47
LM1253A
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM1253AN | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator |
| LM-1256 | 制造商:ROHM 制造商全称:Rohm 功能描述:16 x 16 matrix displays |
| LM-1256_1 | 制造商:ROHM 制造商全称:Rohm 功能描述:16】16 matrix displays |
| LM-1256LB1 | 制造商:ROHM 制造商全称:Rohm 功能描述:16】16 matrix displays |
| LM125AN | 制造商:NSC 制造商全称:National Semiconductor 功能描述:VOLTAGE REGULATORS |
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