84C44X datasheet(24/38 Pages) PHILIPS

24 / 38 page

October 1994

Philips Semiconductors

Product speciﬁcation

8-bit microcontrollers with OSD and VST

84C44X; 84C64X; 84C84X

12.6.3

DERIVATIVE REGISTERS LINE 1A AND LINE 1B

Table 17 Derivative register LINE 1A (address 44H)

Table 18 Description of LINE 1A bits

Table 19 Derivative register LINE 1B (address 45H)

Table 20 Description of LINE 1B bits

FUNCTION

LINE 1A

Determine the character size and vertical position of Row 1 (the second display row).

LINE 1B

Determine the horizontal position of Row 1 and the selection of background and blanking functions.

SZ11

SZ10

VP15

VP14

VP13

VP12

VP11

VP10

BIT SYMBOL

FUNCTION

SZ11

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

selected for Row 1. Character sizes include background. See Table 23.

SZ10

VP15

Vertical position control.

The vertical position of Row 1 is selected by the state of the 6 bits, VP10 to VP15.

For details see Section 12.7.1 “Vertical position”.

VP14

VP13

VP12

VP11

VP10

BLK1

VB1

HP15

HP14

HP13

HP12

HP11

HP10

BIT SYMBOL

FUNCTION

BLK1

Blanking. This bit enables or disables the character display. When BLK1 is:

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

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

VB1

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 VB1 is set to:

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

Logic 0, the background is disabled and only the character is displayed.

HP15

Horizontal position control.

These 6 bits determine the start position of Row 1.

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

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

HP14

HP13

HP12

HP11

HP10

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