MCD212 datasheet(32/87 Pages) MOTOROLA

32 / 87 page

MCD212

5–3

MOTOROLA

5.2.2

Vertical Resolution

The vertical resolution is dependent on the SM (Scan Mode) bit of the DCR1 register, the FD (Frame

Duration) bit which is also in the DCR1 register, and the ST (Standard) bit which is in the CSR1W

The SM bit controls the scan mode of the VDSC by selecting between the interlace mode and the

non–interlace mode as described in Table 5–3 and shown in Figure 5–3.

Table 5–3. Scan Modes

SCAN Mode Description

Non–interlace mode. One image is composed of one field.

Interlace mode. One image is composed of two fields.

NON–INTERLACE

MODE

INTERLACE MODE

LINE 1

LINE 2

LINE 3

LINE N

LINE 1

LINE 3

LINE N–1

LINE 5

LINE 2

LINE 4

LINE 6

LINE N

LINE 1

LINE 3

LINE N–1

LINE 5

LINE 2

LINE 4

LINE 6

LINE N

ODD FIELD

EVEN FIELD

TOTAL IMAGE

IMAGE

••

•

••

•

••

•

••

•

••

•

Figure 5–3. Line Display of Interlace versus Non–interlace Modes

The FD bit and the ST bit only affect the display in the non–interlace mode. They are shown in

Table 5–4.

Table 5–4. Vertical Resolution in the Non–interlace Mode

# of Video Lines

Frame Duration

(ms)

Image

Frequency (Hz)

Display Type

280

PAL

240

15.3

PAL

240

15.3

NTSC

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