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參數(shù)資料
| 型號： | STV9937 |
| 廠商： | 意法半導體 |
| 英文描述： | 120-MHz On-Screen Display for Monitors including PictureBooSTTM and 4 True Independent Window Displays |
| 中文描述： | 120 - MHz的屏幕的顯示器，其中包括PictureBooSTTM和4個真正的獨立的窗口顯示顯示 |
| 文件頁數(shù)： | 9/49頁 |
| 文件大小： | 441K |
| 代理商： | STV9937 |
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STV9937
Register Addressing
2
Register Addressing
All OSD control registers are located in Window 0, Row 0. PictureBooST
TM
control registers are
located in Window 0, Row 1. All color-boxes data are located in Window 0, Row 2.
Three formats are available: A, B and C, as described in the I2C protocol (see
Section 2.1: I2C
Protocol
).
All addresses (FAC and FWR bytes) are based on Formats A or B, and are written in hexadecimal
format.
2.1
I2C Protocol
The serial interface with the microcontroller
is an I2C bus with 2 wires: SCL and SDA.The OSD is a
slave circuit with 2 modes: Write and Read. The slave address of the OSD is BAh in write mode and
BBh in read mode.
2.1.1
Data to Write
In the OSD, the I2C bus is used to write - read:
●
the control data
●
the character codes and their respective color codes
●
the color-boxes (8 color-boxes per window).
A color-box contains the character color, character background color and blink data. There are 8
color-boxes for each OSD window which are used to define the colors available for all the
characters of the given OSD window. 3 bits are required to code the 8 color-boxes. These bits are
the color code.
For more information, refer to
Section 4.5: Character Colors on page 22
.
Each character code is related to its own window, row and column. Consequently, the protocol of
the I2C transmission includes this information (window, row and column) to define the position of the
character on the screen. These 3 pieces of information about the position are transmitted in 2 bytes.
As each character on the screen has its own color code, the same protocol is used to write all the
color codes and character codes. Only the attribute bit called ‘A’ allows the character codes to be
distinguished from the color codes corresponding to one position on the screen.
The control data is also written with the same protocol using windows, rows and columns. Window
0 is reserved for control data and color codes.
2.1.2
Transmission Formats
There are 3 transmission formats to suit the amount of data to update. The transmission format is
coded in the “window/row/column” bytes.
Format A is suitable for updating small amounts of data which are allocated to different window, row
and column addresses.
Format B is recommended for updating data for the same window and the same row address, but
with a different column address and when changing the Character/Color-box attribute (bit A), or
when writing to a different I2C control register.
Format C is appropriate for updating large amounts of data from a full window or full screen. The
window, row and column addresses are incremented automatically when this format is applied.
Data is written to fill all the allocation memory of the windows.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STV9937P | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:120-MHz On-Screen Display for Monitors including PictureBooSTTM and 4 True Independent Window Displays |
| STV9937P/AA | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:120-MHz On-Screen Display for Monitors including PictureBooSTTM and 4 True Independent Window Displays |
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