saa5252 NXP Semiconductors, saa5252 Datasheet - Page 11

• Manufacturer Part Number: saa5252
• Description: Line Twenty-one Acquisition Display Litod
• Manufacturer: NXP Semiconductors

Philips Semiconductors
DISPLAY GENERATOR
General description
The displayed characters are defined on a 5-by-12 matrix
within a 7-by-13 window, allowing one blank pixel either
side of the character and a blank pixel row above. There
are a number of display options available controlled by
Register 1, or external pins in ‘stand-alone’ mode.
The three display modes are video, text and caption, the
device is powered up in the video mode.
The display generator reads the Pre-amble Address Code
(PAC) then the data associated with that row. Each
character is then rounded after which it can be italicized
and/or underlined, depending on the PAC or mid-row
codes, before being passed on to the output circuitry.
Figure 6 shows the character set.
Table 1 Register map (WRITE)
Table 2 Register map (READ)
1996 Jul 18
REGISTER
REGISTER
Line twenty-one acquisition and display (LITOD)
00
01
02
03
04
80
81
82
DF1/2
CLEAR
POR
PARITY
ERROR
PARITY
ERROR
D7
D7
RGB, BLAN
+ve/ ve
CH 2/1
OSD6
0
DATA
BIT 7
DATA
BIT 7
D6
D6
H
+ve/ ve
NARROW/
WIDE
OSD5
0
DATA
BIT 6
DATA
BIT 6
D5
D5
V
+ve/ ve
ACQ OFF
COL4
OSD4
0
DATA
BIT 5
DATA
BIT 5
11
D4
D4
Display of external On-Screen Display (OSD) facilities
The R, G, B and BLAN outputs of the display have the
capability to be put in a 3-state mode allowing other OSD
devices to take control of the television R, G, B and BLAN
signals.
When the BLANIN is held HIGH then the R, G, B and
BLAN outputs from display are disabled and the R, G, B
and BLAN signals come directly from the RGBIN and
BLANIN inputs. This will allow On-Screen Display to be
placed on top of the captioning without any corruption,
leaving the captions intact when the On-Screen Display is
switched off (BLANIN goes LOW). In this form of operation
the RGBIN and RGBOUT pins can be considered
transparent; BLANIN goes through the normal output
buffer to BLAN.
H3
EN1
ROW3
COL3
OSD3
F1/F2
DATA
BIT 4
DATA
BIT 4
D3
D3
H2
EN0
ROW2
COL2
OSD2
EDS
DATA
BIT 3
DATA
BIT 3
D2
D2
H1
M1
ROW1
COL1
OSD1
PARITY
SHUTDOWN
DATA
BIT 2
DATA
BIT 2
D1
D1
Product specification
SAA5252
H0
M0
ROW0
COL0
OSD0
DATA
READY
DATA
BIT 1
DATA
BIT 1
D0
D0