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參數(shù)資料
| 型號： | P83C270AAR |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontrollers for NTSC TVs with On-Screen Display OSD and Closed Caption CC |
| 中文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PDIP52 |
| 文件頁數(shù)： | 33/80頁 |
| 文件大?。?/td> | 266K |
| 代理商： | P83C270AAR |
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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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