參數(shù)資料
型號： P87C770
廠商： NXP Semiconductors N.V.
英文描述： Microcontrollers for NTSC TVs with On-Screen Display (OSD) and Closed Caption (CC)(在NTSC TV中應(yīng)用的具有屏幕顯示和字幕關(guān)閉特點的微控制器)
中文描述： 微控制器用于NTSC電視的屏幕顯示（OSD）和字幕（CC）的（在NTSC電視中應(yīng)用的具有屏幕顯示和字幕關(guān)閉特點的微控制器）
文件頁數(shù)： 33/80頁
文件大小： 266K
代理商： P87C770
1999 Jun 11
33
Philips Semiconductors
Product specification
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
P8xCx70 family
16.1
AFT Control Register (AFCON)
Table 40
AFT Control Register (SFR address EAH)
Table 41
Description of AFCON bits
Table 42
Selection of AFT channel
7
6
5
4
3
2
1
0
AFTH1
AFTH0
AFTL3
AFTL2
AFTL1
AFTL0
AFTC
BIT
SYMBOL
AFTH1
AFTH0
AFTL3
AFTL2
AFTL1
AFTL0
AFTC
DESCRIPTION
7
6
5
4
3
2
1
0
Reserved.
AFT channel selection.
These two bits are used to select the AFT channel; see
Table 42.
AFT reference voltage level selection.
These four bits are used to select the analog
output voltage (V
ref
) of the 4-bit DAC. V
ref
is calculated as shown in the equation below:
V
AFT compare result.
If AFTC = 0; the AFT input voltage is lower than the reference
voltage. If AFTC = 1; the AFC input voltage is higher than the reference voltage.
AFTH1
AFTH0
CHANNEL SELECTED
0
0
1
1
0
1
0
1
AFT0
AFT1
AFT2
illegal code
V
ref
-16
DAC value
1
+
(
)
×
=
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