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參數(shù)資料
| 型號： | LC74785 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | On-Screen Display Controller LSI(屏幕顯示控制器規(guī)模集成電路（LSI）) |
| 中文描述： | 屏幕顯示控制器芯片（屏幕顯示控制器規(guī)模集成電路（LSI）的） |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 268K |
| 代理商： | LC74785 |
No. 5520-8/24
LC74785, LC74785M
The timing of the transfer of caption data to the data output buffer is synchronized with the falling edge of the pulse
output from LN21. Therefore, the software processing shown below is required if the decoder LSI (microcontroller) does
not detect LN21 falling edges.
Since data is output to the output buffer once (during the even field) when MOD1 is low, the data transfer control
operation from the decoder LSI (microcontroller) must be performed at least twice in a single frame (about 32 ms).
If a transfer control operation is performed twice in the same frame, the CPDT output on the second operation will be 16
bits of zero data. This allows the decoder LSI to determine that the data for the next frame has not been transferred yet.
Note: If CS2 remains low, the hardware will not be able to transfer the data to the output buffer. Therefore, the decoder LSI (microcontroller) must reset CS2
to high from low after it completes a data transfer control operation.
Transfer method 2 cannot be used if MOD1 is high (NTSC-TV).
Transfer of 16 data bits
Activity within a given frame (MOD1: low)
Data in which all
16 bits are zero
Figure 5 Transferring caption data from the LC74785/M to the decoder LSI (microcontroller): Method 2
(When it is not possible to allocate a port on the decoder LSI (microcontroller) to detect
falling edges on LN21.)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LC74786JM | On-Screen Display Controller |
| LC74786 | On-Screen Display Controller(屏幕顯示控制器) |
| LC74787JM | SMD-RES,20K,.1%, 1/10W,25PPM,.08X.05 |
| LC74787 | On-Screen Display Controller(屏幕顯示控制器) |
| LC74788JM | TRI N RECP F J/N 0-19 NO SEAL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LC74785M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:On-Screen Display Controller LSI |
| LC74786 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:On-Screen Display Controller |
| LC74786-9606-E | 制造商:ON Semiconductor 功能描述:ON-SCREEN DISPLAY CONTROL - Ammo Pack |
| LC74786JM | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:On-Screen Display Controller |
| LC74786M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:On-Screen Display Controller |
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