TW2837 datasheet(57/232 Pages) RENESAS

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TW2837

FN7742 Rev. 1.00

Page 57 of 232

August 28, 2012

Normal Record Mode

Each channel position and size can be defined using its own PIC_SIZE (1x6C), and PIC_POS (1x6D) register. The

channel size is defined via the PIC_SIZE register such as “0” for horizontal and vertical half size (QUAD), “1” for

horizontal full size and vertical half size, “2” for horizontal half size and vertical full size, and “3” for horizontal and

vertical full size. The channel position is defined via the PIC_POS register such as “0” for no horizontal and vertical

offset, “1” for only horizontal half offset, “2” for only vertical half offset, and “3” for horizontal and vertical half offset.

The channel size and location should be defined within the full picture size. (i.e. PIC_SIZE = “3” & PIC_POS = “2” is not

allowed)

The horizontal full size of picture is controlled via the SIZE_MODE (1x51) register such as “0” for 720 pixels, “1” for

702 pixels, and “2” for 640 pixels. Likewise, the vertical full size is selected by the SYS5060 (1x00) register such as

“0” for 240 lines and “1” for 288 lines.

If more than 2 channels have same region, there will be a conflict of what to display for that area. Generally the

TW2837 defines that the channel 0 has priority over channel 3. So if a conflict happens between more than 2

channels, the channel 0 will be displayed first as top layer and then the channel 1, 2 and 3 are hidden beneath. The

TW2837 also provides a channel pop-up attribute via the POP_UP (1x60, 1x63, 1x66, and 1x69) register to give

priority for another display. If a channel has pop-up attribute, it will be displayed as top layer. The following Figure 38

shows the example of the channel position and size control in normal record mode.

Horizontal Direction (H)

PIC_SIZE = 0

PIC_POS = 1

PIC_SIZE = 0

PIC_POS = 3

PIC_SIZE = 0

PIC_POS = 2

PIC_SIZE = 0

PIC_POS = 0

CH 0

CH 1

CH 3

CH 2

FIGURE 38 THE CHANNEL POSITION AND SIZE CONTROL IN NORMAL RECORD MODE

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