SAA5531 Philips Semiconductors, SAA5531 Datasheet - Page 29

• Manufacturer Part Number: SAA5531
• Description: Enhanced TV microcontrollers with On-Screen Display OSD
• Manufacturer: Philips Semiconductors

Philips Semiconductors
8.6
Features available on the SAA55xx devices are reflected in a specific area of the character ROM. These sections of the
character ROM are mapped to two Special Function Registers: TXT22 and TXT12. Character ROM address 09FEH is
mapped to SFR TXT22 as shown in Table . Character ROM address 09FFH is mapped to SFR TXT12 as shown in
Table .
Table 6 Character ROM - TXT22 mapping
U = used; X = reserved
Table 7 Description of Character ROM address 09FEH bits
Table 8 Character ROM - TXT12 mapping
U = used; X = reserved
Table 9 Description of Character ROM address 09FFH bits
2000 Feb 23
Character ROM
address 09FEH
Mapped to TXT22
Character ROM
address 09FFH
Mapped to TXT12
Enhanced TV microcontrollers with
On-Screen Display (OSD)
MAPPED ITEMS
MAPPED ITEMS
0 to 3, 5 to 11
Character set feature bits
5 to 11
BIT
BIT
0
1
2
3
4
4
reserved; normally set to logic 1
1 = Text Acquisition available
0 = Text Acquisition not available
1 = Closed Caption Acquisition available
0 = Closed Caption Acquisition not available
1 = PWM0, PWM1, PWM2 and PWM3 output routed to Port 2.1 to Port 2.4 respectively
0 = PWM0, PWM1, PWM2 and PWM3 output routed to Port 3.0 to Port 3.3 respectively
1 = 10 page available
0 = 6 page available
reserved; normally set to logic 1
1 = Spanish character set present
0 = no Spanish character set present
reserved; normally all set to logic 1
11
11
X
X
10
10
X
X
X
X
9
9
X
X
8
8
X
X
7
7
7
29
FUNCTION
FUNCTION
X
X
6
6
6
X
X
5
5
5
U
U
4
4
4
6
U
X
3
3
3
5
Preliminary specification
U
X
2
2
2
4
SAA55xx
U
X
1
1
1
3
X
X
0
0
0
2