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84C44X датащи(PDF) 14 Page - NXP Semiconductors

номер детали 84C44X
подробное описание детали  8-bit microcontrollers with OSD and VST
PDF  38 Pages
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

84C44X датащи(HTML) 14 Page - NXP Semiconductors

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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 VDD and VSS.
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 Vref
AFC2 AFC1 AFC0
Vref
Vref
(for VDD = 5.0 V)
0
0
0
VDD × 0.125
0.625 V
0
0
1
VDD × 0.250
1.250 V
0
1
0
VDD × 0.375
1.875 V
0
1
1
VDD × 0.500
2.500 V
1
0
0
VDD × 0.625
3.125 V
1
0
1
VDD × 0.750
3.750 V
1
1
0
VDD × 0.875
4.375 V
1
1
1
VDD
5.000 V
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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