SAA5500PS Philips Semiconductors, SAA5500PS Datasheet - Page 28

• Manufacturer Part Number: SAA5500PS
• Description: Standard TV Microcontrollers with On-Screen Display(OSD)
• Manufacturer: Philips Semiconductors

Philips Semiconductors
8.5
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 4. Character ROM address 09FFH is mapped to SFR TXT12 as shown in
Table 6.
Table 4 Character ROM - TXT22 mapping
U = used; X = reserved
Table 5 Description of Character ROM address 09FEH bits
Table 6 Character ROM - TXT12 mapping
U = used; X = reserved
Table 7 Description of Character ROM address 09FFH bits
1999 Oct 27
Character ROM
address 09FEH
Mapped to TXT22
Character ROM
address 09FFH
Mapped to TXT12
Standard TV microcontrollers with
On-Screen Display (OSD)
MAPPED ITEMS
MAPPED ITEMS
BIT NUMBER
BIT NUMBER
0 to 3, 5 to 11
Character set feature bits
6 to 11
0
1
2
3
4
5
4
reserved; normally set to logic 1
1 = Text Acquisition available
0 = Text Acquisition not available
reserved
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
0 = standard device
reserved; normally set to logic 1
1 = Spanish character set present
0 = no Spanish character set present
reserved; normally 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
28
FUNCTION
FUNCTION
X
X
6
6
6
U
X
5
5
5
U
U
4
4
4
6
U
X
3
3
3
5
Preliminary specification
X
X
2
2
2
4
SAA55xx
U
X
1
1
1
3
X
X
0
0
0
2