參數(shù)資料
型號(hào)： SAA5500PS/NNNN
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PDIP52
封裝： 0.600 INCH, PLASTIC, SDIP-52
文件頁數(shù)： 21/80頁
文件大?。?/td> 340K
代理商： SAA5500PS/NNNN
1999 Oct 27
28
Philips Semiconductors
Preliminary specication
Standard TV microcontrollers with
On-Screen Display (OSD)
SAA55xx
8.5
Character set feature bits
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
MAPPED ITEMS
11
10
9
8
7
6
5
4
3
2
1
0
Character ROM
address 09FEH
XXXXXX
U
X
U
X
Mapped to TXT22
76543210
BIT NUMBER
FUNCTION
0
reserved; normally set to logic 1
1
1 = Text Acquisition available
0 = Text Acquisition not available
2
reserved
3
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
4
1 = 10 page available
0 = 6 page available
5
0 = standard device
6 to 11
reserved; normally set to logic 1
MAPPED ITEMS
11
10
9
8
7
6
5
4
3
2
1
0
Character ROM
address 09FFH
XXXXXXX
U
X
XXX
Mapped to TXT12
65432
BIT NUMBER
FUNCTION
4
1 = Spanish character set present
0 = no Spanish character set present
0 to 3, 5 to 11
reserved; normally set to logic 1
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