MCD212 datasheet(61/87 Pages) MOTOROLA

61 / 87 page

MCD212

8–2

MOTOROLA

The pixel hold function causes a “mosaic” or “granulation” effect in the horizontal direction (i.e., the

resolution is lowered without the image size changing).

The pixel hold factor is programmed via the mosaic pixel hold factor register located at location hD9

for plane A and hDA for plane B. Plane A is programmed via CH#1 and Plane B is programmed via

CH#2.

The pixel hold factor can be any value from 2 to 255. The pixel hold factor is effective at both normal

resolution and double resolution according to the resolution.

8.3

REGIONS

Within the image planes, regions can be defined by means of two region flags, called flag RF0 and

flag RF1. Two region flags allow regions to overlap (see Figure 8–2). These flags can be set and reset

by eight region control registers. These registers are loaded during the horizontal and vertical retrace

periods, using the control mechanism.

RF0

RF1

Figure 8–2. Example Showing Overlapping and Non–overlapping Regions

The region control registers 0 – 7 can control the two region flags in two modes. In the first mode,

registers 0 – 3 are linked to region flag 0 and registers 4 – 7 are linked to region flag 1 (see

Figure 8–3). In the second mode, the eight registers are explicitly linked to a region flag (see Figure

8–4). The first mode allows the two region flags to be changed at the same position. The selection of

the mode used is done in the “image coding method register” by the NR bit.

RF0:

RF1:

REGION

CONTROL

HORIZONTAL

POSITION

REGION

CONTROL

HORIZONTAL

POSITION

CONSTRAINT: X4 < X5 < X6 < X7

CONSTRAINT: X0 < X1 < X2 < X3

Figure 8–3. Implicit Control of Region Flags (NR = 1)

REGION

CONTROL

012

CONSTRAINT: X0 < X1 < X2 < X3 < X4 < X5 < X6 < X7

HORIZONTAL

POSITION

REGION

FLAG

RF0/

RF1

RF0/

RF1

RF0/

RF1

RF0/

RF1

RF0/

RF1

RF0/

RF1

RF0/

RF1

RF0/

RF1

Figure 8–4. Explicit Control of Region Flags (NR = 0)

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