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參數(shù)資料
| 型號： | LM1253A |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator |
| 中文描述： | 單片三180兆赫的I2C顯像管預(yù)先集成在屏幕顯示（OSD）發(fā)生器模擬放大器 |
| 文件頁數(shù)： | 46/57頁 |
| 文件大?。?/td> | 1621K |
| 代理商： | LM1253A |
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Control Register Definitions
(Continued)
TABLE 12. PLL Setting (Register 843Eh)
Note: These settings are valid when R28 = 6.2k, C23 = 0.1 μF,
C33 = 2.2 nF.
Frequency
Range
30 kHz
1
35 kHz
1
40 kHz
2
2
50 kHz
2
55 kHz
2
60 kHz
2
65 kHz
2
70 kHz
3
75 kHz
3
80 kHz
3
85 kHz
3
90 kHz
3
95 kHz
3
100 kHz
3
Software Reset and Test Control Register (I
2
C address 843Fh).
REGISTER NAME: SRTSTCTRL (843Fh)
Value for Register 843Eh
01h
01h
02h
02h
02h
02h
02h
02h
03h
03h
03h
03h
03h
03h
03h
Bit 7
Bit 0
RSV
Bit 0:
AID
Software Reset. Setting this bit causes a software reset.All registers (except this one) are loaded with their default val-
ues. All operations currently in progress are aborted (except for I
2
C transactions). This bit automatically clears itself
when the reset has been completed.
Bits 1–5: Reserved
Bit 6:
Auto Increment Disable. Setting this bit to one disables the automatic address increment feature of the I
2
C register ac-
cess protocol.
Bit 7:
Reserved
RSV
RSV
RSV
RSV
RSV
SRST
ATTRIBUTE TABLE AND ENHANCED FEATURES
Each display character and SL in the Display Page RAM will have a 4-bit Attribute Table entry associated with it. The user should
note that two-color display characters and four-color display characters use two different Attribute Tables, effectively providing
16 attributes for two-color display characters and 16 attributes for four-color display characters.
For two-color characters the attribute contains the code for the 9-bit foreground color (Color 2), the code for the 9-bit background
color (Color 1), and the character’s enhanced features (Button Box, Blinking, Heavy Box, Shadowing, bordering, etc.).
For four-color characters the attribute contains the code for the 9-bit Color 1, the code for the 9-bit Color 2, the code for the 9-bit
Color 3, the code for the 9-bit Color 4 and the character’s enhanced features (Button Box, Blinking, Heavy Box, Shadowing, bor-
dering, etc.).
TWO-COLOR ATTRIBUTE FORMAT
REGISTER NAME: ATT2C3n (8443h +(n*4)), ATT2C2n (8442h +(n*4)),
where n = attribute code
(See Table 13)
Bit 31
Bit 24
Bit 23
Bit 16
RSV
REGISTER NAME: ATT2C1n (8441h +(n*4)), ATT2C0n (8440h +(n*4)),
where n = attribute code
(See Table 13)
RSV
RSV
RSV
RSV
RSV
RSV
RSV
RSV
RSV
EFB3
EFB2
EFB1
EFB0
C2B2
C2B1
Bit 15
Bit 8
Bit 7
Bit 0
C2B0
Bits 8–0:
C2G2
C2G1
C2G0
C2R2
C2R1
C2R0
C1B2
C1B1
C1B0
C1G2
C1G1
C1G0
C1R2
C1R1
C1R0
Color 1. These nine bits indicate the value of the color to be displayed as color 1. This is considered to be the back-
ground color and is displayed when the corresponding pixel data bit is a zero.
Color 2. These nine bits indicate the value of the color to be displayed as color 2. This is considered to be the fore-
ground color and is displayed when the corresponding pixel data bit is a one.
Bits 17–9:
L
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