84C44X datasheet(23/38 Pages) PHILIPS

23 / 38 page

October 1994

Philips Semiconductors

Product speciﬁcation

8-bit microcontrollers with OSD and VST

84C44X; 84C64X; 84C84X

12.6.2

DERIVATIVE REGISTERS LINE 0A AND LINE 0B

Table 13 Derivative register LINE 0A (address 41H)

Table 14 Description of LINE 0A bits

Table 15 Derivative register LINE 0B (address 42H)

Table 16 Description of LINE 0B bits

FUNCTION

LINE 0A

Determine the character size and vertical position of Row 0 (the first display row).

LINE 0B

Determine the horizontal position of Row 0 and the selection of background and blanking functions.

SZ01

SZ00

VP05

VP04

VP03

VP02

VP01

VP00

BIT SYMBOL

FUNCTION

SZ01

Character size. The state of these two bits enable one of four possible character sizes to be

selected for Row 0. Character sizes include background. See Table 23.

SZ00

VP05

Vertical position control.

The vertical position of Row 0 is selected by the state of the 6 bits, VP00 to VP05.

For details see Section 12.7.1 “Vertical position”.

VP04

VP03

VP02

VP01

VP00

BLK0

VB0

HP05

HP04

HP03

HP02

HP01

HP00

BIT SYMBOL

FUNCTION

BLK0

Blanking. This bit enables or disables the character display. When BLK0 is set to:

Logic 1, the outputs VOW1, VOW2, VOW3 and VOB are enabled; characters are displayed.

Logic 0, the outputs VOW1, VOW2, VOW3 and VOB are disabled; no characters are displayed.

VB0

Background. This bit determines whether the background display is selected or not.

The visual effect of background versus no background is shown in Fig.26. When VB0 is set to:

Logic 1, the characters in this row are displayed with background.

Logic 0, the background is disabled and only the characters are displayed.

HP05

Horizontal position control.

These 6 bits determine the start position of Row 0.

The horizontal position control is only active during OSDC clock cycles.

For details Section 12.7.2 “Horizontal position” and Fig.25.

HP04

HP03

HP02

HP01

HP00

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