參數(shù)資料
型號(hào): PCA84C886
廠商: NXP Semiconductors N.V.
英文描述: Microcontrollers for TV tuning control and OSD applications(應(yīng)用于TV調(diào)頻和OSD的微控制器)
中文描述: 微控制器的控制和調(diào)整(應(yīng)用于電視調(diào)頻和OSD的微控制器應(yīng)用的電視OSD)
文件頁數(shù): 27/72頁
文件大?。?/td> 564K
代理商: PCA84C886
1995 Jun 15
27
Philips Semiconductors
Preliminary specification
Microcontrollers for TV tuning
control and OSD applications
PCA84C646; PCA84C846
12.3
Derivative Register 33 (CON3)
Derivative Register 33 is to control the character blinking related operation. Figure 18 shows the timing diagram of
character blinking frequency and blinking ratio.
Table 26
Derivative Register 33
Table 27
Description of Derivative Register 33 bits
7
6
5
4
3
2
1
0
BR1
BR0
BF1
BF0
BIT
SYMBOL
BR1
BR0
BF1
BF0
DESCRIPTION
7 to 4
3
2
1
0
These 4 bits are reserved.
Blinking active ratio select bits. These two bits allow one from a choice of three active
blinking ratios to be selected; see Table 28.
Blinking frequency select bits. These two bits allow one from a choice of four blinking
frequencies to be selected.
f
16
2
×
,
where ‘2
(BF1, BF0)
’ is a decimal value determined by bits BF1 and BF0; see Table 29.
Blinking frequency
BF1, BF0
(
)
----------------------------------------Hz
=
Table 28
Active ratio determined by bits BR1 and BR0
BR1
BR0
ACTIVE RATIO
0
0
1
1
0
1
0
1
3 : 1 (default)
1 : 1
1 : 3
reserved
Table 29
Blinking frequency determined by (BF1,BF0)
BF1 BF0 2
(BF1, BF0)
BLINKING FREQUENCY (Hz)
0
0
1
1
0
1
0
1
1
2
4
8
1
16
×
f
VSYNC
1
32
×
f
VSYNC
1
64
×
f
VSYNC
1
128
×
f
VSYNC
(default)
handbook, full pagewidth
VSYNC
VSYNC
16
0
1
2
3
7
8
10 11
60 Hz
14 15 0
1
2
3
7
8
10 11
60 Hz
14 15
Blinking frequency:
Blinking ratio: 1 : 3
Blinking frequency:
Blinking ratio: 1 : 1
Blinking frequency:
Blinking ratio: 3 : 1
Blinking frequency:
Blinking ratio: 1 : 3
Blinking frequency:
Blinking ratio: 1 : 1
Blinking frequency:
Blinking ratio: 3 : 1
MRA848
f
VSYNC
16
f
VSYNC
16
f
VSYNC
32
f
VSYNC
32
f
VSYNC
32
f
Fig.18 Example of character blinking (NTSC 525LPF/60Hz).
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