PCA84C646P datasheet(49/72 Pages) PHILIPS

49 / 72 page

1995 Jun 15

Philips Semiconductors

Preliminary speciﬁcation

Microcontrollers for TV tuning

control and OSD applications

PCA84C646; PCA84C846

12.5

Derivative Register 35 (VPOS)

Derivative Register 35 selects the vertical starting position of the display row.

Table 33 Derivative Register 35 (address 35H)

Table 34 Description of Derivative Register 35 bits

12.6

Derivative Register 36 (HPOS)

Derivative Register 36 selects the horizontal starting position of the display row.

Table 35 Derivative Register 36 (address 36H)

Table 36 Description of Derivative Register 36 bits

76543210

−−

BIT

SYMBOL

DESCRIPTION

7 to 6

−

Reserved.

These 6 bits enable 1 of 64 vertical start positions to be selected for the display row.

The vertical starting position is calculated as follows:

Where (V5 to V0) is the decimal value of the contents of Register 35; (V5 to V0)

≥ 0.

4V4

3V3

2V2

1V1

0V0

76543210

−−

BIT

SYMBOL

DESCRIPTION

7 to 6

−

Reserved.

These 6 bits enable 1 of 64 horizontal start positions to be selected for the display row.

The horizontal starting position is calculated as follows:

Where (H5 to H0) is the decimal value of the contents of Register 36; (H5 to H0)

≥ 10.

4H4

3H3

2H2

1H1

0H0

V5 to V0

()

[] horizontal scan lines

H5 to H0

()

[] OSD clock cycle

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