Specifications

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1.5. OSD

The CL765 supports OSD. OSD is the function to compound Camera image and

Background BMP image and dispkay that on LCD. OSD has Overwrite function

and Overlay function and Chroma-Key is used to perform the functions. Chroma-

Key is a special key used for the area where OSD BMP image and Camera image

are displayed. It is used to distinguish Camera image from OSD BMP image. The

OSD is a collection of functions that composes video image from camera and

graphical bitmap image (OSD image) mainly for displaying menus, and then

displays on external visual devices. The CL765 supports two separated OSD

images and the bitmap formats for OSD image are 8bit–indexed, 4444-αRGB and

565-RGB. The 8bit-index format is 8bpp while 4444-αRGB and 565-RGB are 16bpp.

The OSD functions that provided by the CL765 are alpha blending and chroma-

keying. The alpha blending is a function that blends background (generally video

image) and foreground (generally OSD image) according to given blend ratio,

while the chroma-keying is a multiplexing function.

1.6. HOST CPU INTERFACE

The CL765 provides 18-bit wide bus for Host CPU interface. There are two main

usages of Host CPU interface, for register/memory accesses or for LCD accesses.

In normal operation mode, i.e., the CL765 is activated, the Host CPU interface is

used for accessing the CL765’s internal registers and memories. In the mode, only

lower 16-bit of data bus is used. In Bypass mode, i.e., the CL765 is sleep and the

Host interface is connected to the CL765’s LCD interface, Host CPU can directly

read and write the LCD module. In the mode, 18-bit data bus is used to access

registers and GRAM of LCD module.

1.7. LCD CONTROLLER & CCIR 601/656 INTERFACE

The CL765 supports various LCD modules mainly for 80-Type LCD modules and

RGB-Type LCD modules.

For 80-Type LCD modules, the data bus between the CL765 and LCD module is

configured up to 18 bits (actually one of 8-bit, 9-bit, 12-bit, 16-bit and 18-bit). For

the LCD, two LCD modules can be connected to the CL765, i.e., main LCD and

sub LCD.

For RGB-Type LCD modules, the data bus width is one of 6-bit of 18-bit. For the

modules, the CL765 provides and generates pixel-clock, horizontal-/vertical-sync

and video data enable with data bus. The LCD sync timing is programmable, so

various sized LCD modules can be controlled by the CL765.

Two-LCD mode, main and sub LCD’s, only one LCD can be activated at a time.

For two-LCD mode, different types of LCD can also be used. For example, a RGB-

Type for main LCD and an 80-Type for sub LCD are applicable.