參數(shù)資料
型號(hào)： LM1247AAG/NA/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 音頻／視頻放大
英文描述： 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24
封裝： PLASTIC, DIP-24
文件頁數(shù)： 27/48頁
文件大小： 3141K
代理商： LM1247AAG/NA/NOPB
Control Register Definitions (Continued)
Bit 0
On-Screen Display Enable. The On-Screen Display will be disabled when this bit is a zero. When this bit is a
one the On-Screen Display will be enabled. This controls both Window 1 and Window 2.
Bit 1
Display Window 1 Enable. When this bit and Bit 0 of this register are both ones, Display Window 1 is enabled.
If either bit is a zero, then Display Window 1 will be disabled.
Bit 2
Display Window 2 Enable. When this bit and Bit 0 of this register are both ones, Display Window 2 is enabled.
If either bit is a zero, then Display Window 2 will be disabled.
Bit 3
Clear Display Page RAM. Writing a one to this bit will result in setting all of the Display Page RAM values to
zero. This bit is automatically cleared after the operation is complete.
Bit 4
Transparent Disable. When this bit is a zero, a palette color of black (i.e., color palette look-up table value of
0x00) in the first 8 palette look-up table address locations (i.e., ATT0–ATT7) will be interpreted as transparent.
When this bit is a one, the color will be interpreted as black.
Bits 7–5
Reserved (Should be set to zero)
Frame Control Register 2:
FRMCTRL1 (0x8401)
Pixels per Line
Blink Period
PL[2:0]
BP[4:0]
Bits 4–0
Blinking Period. These five bits set the blinking period of the blinking feature, which is determined by
mulitiplying the value of these bits by 8, and then multiplying the result by the vertical field rate.
Bits 7–5
Pixels per Line. These three bits determine the number of pixels per line of OSD characters. See Table 21
which gives the maximum horizontal scan rate. Also see Table 3 since the maximum recommended scan rate
is also a function of the PLLFREQRNG register, 0x843E[1:0].
TABLE 21. OSD Pixels per Line
Bits 7–5
Description
Max Horizontal Frequency (kHz)
0x0
512 pixels per line
125
0x1
576 pixels per line
119
0x2
640 pixels per line
112
0x3
704 pixels per line
106
0x4
768 pixels per line
100
0x5
832 pixels per line
93
0x6
896 pixels per line
87
0x7
960 pixels per line
81
Character Font Access Register:
CHARFONTACC (0x8402)
Reserved
Select
Plane
X
XXXXX
C/A
Bit
Bit 0
This is the Color Bit Plane Selector. This bit must be set to 0 to read or write a two-color attribute from the
range 0x0000 to 0x2FFF. When reading or writing four-color attributes from the range 0x3000 to 0x3FFF, this
bit is set to 0 for the least significant plane and to 1 for the most significant plane. It is also required to set this
bit to read the individual bit planes of the four color character fonts in 0x3000 to 0x3FFF and 0x7000 to
0x7FFF.
Bit 1
This is the Character/Attribute Selector. This applies to reads from the Display Page RAM (address range
0x8000–0x81FF). When a 0, the character code is returned and when a 1, the attribute code is returned.
Bits 7–2
Reserved. These should be set to zero.
Vertical Blank Duration Register:
VBLANKDUR (0x8403)
Res’d
Vertical Blanking Duration
X
VB[6:0]
LM1247
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM1247DMC/NA 制造商:Texas Instruments 功能描述:
LM124A 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Power Quad Operational Amplifiers
LM124AD 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW POWER QUAD OPERATIONAL AMPLIFIERS
LM124ADR 制造商:TI 制造商全稱:Texas Instruments 功能描述:QUADRUPLE OPERATIONAL AMPLIFIERS
LM124ADT 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier
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