PCA8514P datasheet(22/64 Pages) PHILIPS

22 / 64 page

1995 Nov 27

Philips Semiconductors

Product speciﬁcation

Stand-alone OSD

PCA8514

9.9

Command 8

Table 26 Command 8 format

Command 8 loads Control Register 2 with data that

selects the input polarity of HSYNC and VSYNC (see

Fig.14) and also selects the Display modes.

Table 27 Selection of input polarity of HSYNC/VSYNC

Table 28 Selection of Display Mode

BS1 BS0

76543210

0101

Hp/Vp

INPUT POLARITY

active LOW (the default setting)

active HIGH

DISPLAY MODE

Mode 0: this is the No background mode.

The OSD characters are superimposed on

the TV video signals (see Fig.15).

Mode 1: this is the North-West shadowing

mode; available only with character sizes

2V/2H or 4V/4H. The shadows are

generated as if a light source was placed

North-West of the character (see

Figs 16 to 18). The shadows generated lie

within 18 rows in a vertical direction but can

be extended by one bit to the next

characters first column, in a horizontal

direction (see Figs 19 and 20).

Mode 2: this is the Box shadowing mode. A

background dot matrix of 12

× 18 bits

surrounds the character font; see

Figs 21 and 22.

Mode 3: this is the Frame shadowing

(raster blanking) mode. A background

colour ﬁlls the whole screen when no bit

patterns are being displayed (see Fig.23).

1 of 16 background colours can be selected

using Command F; the default background

colour is Blue.

9.10

Command 9

Table 29 Command 9 format

This command loads Control Register 3 with data that

controls both the character blinking frequency and the

active ratio of the character blinking frequency.

Figures 25 to 29 show how blinking influences the display

in different display modes.

Table 30 Selection of Blinking frequency

Table 31 Selection of active ratio of character blinking

BS1 BS0

7654

3210

0110

BF1

BF0

BR1

BR0

BF1 BF0

BLINKING FREQUENCY (Hz)

; this is the default setting

BR1 BR0

ACTIVE RATIO

3 : 1 (the default setting)

1:1

1:3

reserved

VSYNC

-----------------

VSYNC

-----------------

VSYNC

-----------------

VSYNC

128

-----------------

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