SAA5X9X Datasheet, PDF (24/68 Pages) NXP Semiconductors – Economy teletext and TV microcontrollers

Philips Semiconductors
Economy teletext and TV microcontrollers
Preliminary specification
SAA5x9x family
REGISTER
FUNCTION
Teletext Register 10 (TXT10) - WRITE only
C5 to C0
memory column to be accessed by TXT11
Teletext Register 11 (TXT11)
D7 to D0
data byte written to, or read from teletext memory
Teletext Register 12 (TXT12) - READ only
625/525 SYNC
ROM VER R4 to R0
TXT ON
VIDEO SIGNAL
QUALITY
a 625-line CVBS signal (logic 0), or a 525-line CVBS signal (logic 1) is being input
mask programmable identification for character set
power has been applied to the teletext hardware (logic 1)
CVBS input can be locked on by the teletext decoder (logic 1)
Teletext Register 13 (TXT13)
VPS RECEIVED
set to logic 1 when VPS data is received
PAGE CLEARING set when software requested page clear in progress
525 DISPLAY
set to logic 1 when 525-line syncs are driving the display
525 TEXT
set to logic 1 when 525-line teletext is received
625 TEXT
set to logic 1 when 625-line teletext is received
PKT 8/30
set to logic 1 when packet 8/30 is detected
FASTEXT
set to logic 1 when packet X27/0 is detected
TIB
text interface busy; logic 1 indicates that TXT registers 0 to 16 cannot currently be accessed
Teletext Register 14 (TXT 14) - WRITE only; note 3
PAGE3 to PAGE0 selects which page to display
Teletext Register 15 (TXT15) - WRITE only; note 3
BLOCK3 to BLOCK0 selects which memory block accessed by TXT9, 10 and 11
Teletext Register 16 (TXT16) - WRITE only
Y2 to Y0
sets vertical position of display area
X1 to X0
sets horizontal position of display area
Teletext Register 17 (TXT17) - Write only
FORCE ACQ0,1
force acquisition mode
FORCE 625
force display to 625-line mode
FORCE 525
force display to 525-line mode
SCREEN COL 2 to 0 defines colour displayed instead of TV picture and black background
1997 Jul 07
24