2004 Mar 01
51
Philips Semiconductors
Product specification
Digital video encoder
SAA7102; SAA7103
Table 76 Subaddresses 76H, 77H and 7CH
Table 77 Subaddresses 78H, 79H and 7CH
Table 78 Subaddresses 7AH to 7CH
Table 79 Subaddress 7CH
Table 80 Subaddresses 7EH and 7FH
DATA BYTE
DESCRIPTION
REMARKS
TTXOVS
first line of occurrence of signal TTXRQ on pin TTXRQ_XCLKO2
(CLK2EN = 0) in odd field
TTXOVS = 05H; is default after
reset if strapped to PAL
TTXOVS = 06H; is default after
reset if strapped to NTSC
line = ( 4) for M-systems
line = ( 1) for other systems
TTXOVE
last line of occurrence of signal TTXRQ on pin TTXRQ_XCLKO2
(CLK2EN = 0) in odd field
TTXOVE = 16H; is default after
reset if strapped to PAL
TTXOVE = 10H; is default after
reset if strapped to NTSC
line = ( 3) for M-systems
line = TTXOVE for other systems
DATA BYTE
DESCRIPTION
REMARKS
TTXEVS
first line of occurrence of signal TTXRQ on pin TTXRQ_XCLKO2
(CLK2EN = 0) in even field
TTXEVS = 04H; is default after
reset if strapped to PAL
TTXEVS = 05H; is default after
reset if strapped to NTSC
line = ( 4) for M-systems
line = ( 1) for other systems
TTXEVE
last line of occurrence of signal TTXRQ on pin TTXRQ_XCLKO2
(CLK2EN = 0) in even field
TTXEVE = 16H; is default after
reset if strapped to PAL
TTXEVE = 10H; is default after
reset if strapped to NTSC
line = ( 3) for M-systems
line = TTXEVE for other systems
DATA BYTE
DESCRIPTION
FAL
first active line = FAL + 4 for M-systems and FAL + 1 for other systems, measured in lines
FAL = 0 coincides with the first field synchronization pulse
LAL
last active line = LAL + 3 for M-systems and LAL for other system, measured in lines
LAL = 0 coincides with the first field synchronization pulse
DATA BYTE
LOGIC
LEVEL
DESCRIPTION
TTX60
0
enables NABTS (FISE = 1) or European TTX (FISE = 0); default after reset
1
enables world standard teletext 60 Hz (FISE = 1)
DATA BYTE
DESCRIPTION
LINE
individual lines in both fields (PAL counting) can be disabled for insertion of teletext by the respective
bits, disabled line = LINExx (50 Hz field rate)
this bit mask is effective only if the lines are enabled by TTXOVS/TTXOVE and TTXEVS/TTXEVE