參數(shù)資料
型號: 84C44X
廠商: NXP Semiconductors N.V.
英文描述: 8-bit microcontrollers with OSD and VST
中文描述: 8 - OSD和偉仕位微控制器
文件頁數(shù): 14/38頁
文件大?。?/td> 265K
代理商: 84C44X
October 1994
15
Philips Semiconductors
Product specification
8-bit microcontrollers with OSD and VST
84C44X; 84C64X; 84C84X
10 AFC INPUT
The AFC input is used to measure the level of the
Automatic Frequency Control signal. This is achieved by
comparing the AFC input signal with the output of a 3-bit
DAC as shown in Fig.14. DAC analog switches select one
of 8 resistor taps connected between V
DD
and V
SS
.
Consequently, eight different voltages may be selected
(see Table 4). The compare signal AFCC, can be tested to
determine whether the AFC input is higher or lower than
the DAC level.
The AFC input shares the same pin as the Derivative Port
line DP1.7. Setting the enable bit AFCE to:
Logic 1, selects the AFC function
Logic 0, selects the Derivative Port DP1.7 function.
Table 4
Selection of V
ref
AFC2 AFC1 AFC0
V
ref
V
ref
(for V
DD
= 5.0 V)
0.625 V
1.250 V
1.875 V
2.500 V
3.125 V
3.750 V
4.375 V
5.000 V
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
V
DD
×
0.125
V
DD
×
0.250
V
DD
×
0.375
V
DD
×
0.500
V
DD
×
0.625
V
DD
×
0.750
V
DD
×
0.875
V
DD
handbook, full pagewidth
COMPARATOR
3-BIT DAC
EN
EN
DP1.7 / AFC
AFC2
AFC1
AFC0
AFCE
AFCC
internal bus
inner latches
DP1.7
MCD178
Fig.14 AFC circuit.
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