PCA8515P Philips Semiconductors, PCA8515P Datasheet - Page 22

• Manufacturer Part Number: PCA8515P
• Description: Stand-alone OSD
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9.9
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
1995 Jan 19
0
0
1
1
Hp/Vp
BS1
Stand-alone OSD
0
S1
0
1
Command 8
BS0
active LOW (the default setting)
active HIGH
0
1
0
1
1
S0
7
0
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
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.
6
1
18 bits surrounds the character
INPUT POLARITY
5
0
DISPLAY MODE
4
1
Hp
3
Vp
2
S1
1
S0
0
22
9.10
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
BR1
BF1
0
0
0
1
1
0
0
1
1
Command 9
BS0
1
BF0
BR0
0
1
0
1
0
1
0
1
7
0
3 : 1 (the default setting)
1 : 1
1 : 3
reserved
f
---------------- -
f
---------------- -
f
---------------- -
f
---------------- -
VSYNC
VSYNC
VSYNC
VSYNC
128
6
1
16
32
64
BLINKING FREQUENCY (Hz)
5
1
; this is the default setting
4
0
ACTIVE RATIO
Preliminary specification
BF1 BF0 BR1 BR0
3
PCA8515
2
1
0