PCA8516P datasheet(22/64 Pages) PHILIPS

22 / 64 page

1995 Mar 30

Philips Semiconductors

Preliminary speciﬁcation

Stand-alone OSD

PCA8516

9.9

Command 8

Table 27 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 28 Selection of input polarity of HSYNC/VSYNC

Table 29 Selection of Display Mode

BS1

BS0

76543210

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

× 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 30 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 31 Selection of Blinking frequency

Table 32 Selection of active ratio of character blinking

BS1

BS0

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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