SAA5X9X Datasheet, PDF (22/68 Pages) NXP Semiconductors – Economy teletext and TV microcontrollers

Philips Semiconductors
Economy teletext and TV microcontrollers
Preliminary specification
SAA5x9x family
REGISTER
FUNCTION
Teletext Register 0 (TXT0) - WRITE only
X24 POSN
store packet 24 in extension packet memory (logic 0) or page memory (logic 1)
DISPLAY X24
display X24 from page memory (logic 0) or extension packet memory (logic 1)
AUTO FRAME
FRAME output switched off automatically if any video displayed (logic 1)
DISABLE HDR
ROLL
disable writing of rolling headers and time into memory (logic 1)
DISPLAY STATUS display row 24 only (logic 1)
ROW ONLY
DISABLE FRAME FRAME output always LOW (logic 1)
VPS ON
INV ON⁽³⁾
enable capture of VPS data (logic 1)
enable capture of inventory page in block 8 (logic 1)
Teletext Register 1 (TXT1) - WRITE only
EXT PKT OFF⁽³⁾
disable decoding of extension packets (logic 1)
8-BIT
data in packets 0 to 24 written into memory without error checking (logic 1)
ACQ OFF
prevent teletext acquisition section writing to memory (logic 1)
X26 OFF
disable automatic processing of packet 26 data (logic 1)
FULL FIELD
decode teletext on VBI lines only (logic 0) or decode teletext on any line (logic 1)
FIELD POLARITY VSYNC in first half of the line (logic 0) or second half of the line (logic 1) at start of even field
H POLARITY
HSYNC input positive-going (logic 0) or negative-going (logic 1)
V POLARITY
VSYNC input positive-going (logic 0) or negative-going (logic 1)
Teletext Register 2 (TXT2) - WRITE only
REQ3 to REQ0⁽³⁾ selects which page is modified by TXT3 page request data
SC2 to SC0
start column at which page request data written to TXT3, page request data is placed
Teletext Register 3 (TXT3) - WRITE only
PRD4 to PRD0
page request data
Teletext Register 4 (TXT4) - WRITE only
OSD BANK
ENABLE⁽⁴⁾
bank switching of OSD enabled (logic 1)
QUAD WIDTH
ENABLE⁽⁴⁾
enable quad width characters (logic 1)
EAST/ WEST
western languages selected (logic 0) or Eastern languages selected (logic 1)
DISABLE DBL
HGHT
disable display of double height teletext control codes (logic 1) in OSD boxes
B MESH ENABLE enable meshing of area with black background (logic 1)
C MESH ENABLE enable meshing of area with other background colours (logic 1)
TRANS ENABLE set black background to transparent i.e. video is displayed (logic 1)
SHADOW ENABLE enable south-east shadowing (logic 1)
1997 Jul 07
22