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PIC12F635E/P bảng dữ liệu(PDF) 70 Page - Microchip Technology

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Giải thích chi tiết về linh kiện  8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY
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PIC12F635/PIC16F636/639
DS41232B-page 68
Preliminary
© 2005 Microchip Technology Inc.
7.6
Comparator Reference
The comparator module also allows the selection of an
internally generated voltage reference for one of the
comparator inputs. The VRCON register (Register 7-3)
controls the voltage reference module shown in
Figure 7-8.
7.6.1
CONFIGURING THE VOLTAGE
REFERENCE
The voltage reference can output 32 distinct voltage
levels, 16 in a high range and 16 in a low range.
The following equation determines the output voltages:
EQUATION 7-1:
7.6.2
VOLTAGE REFERENCE
ACCURACY/ERROR
The voltage reference is VDD derived and therefore, the
CVREF output changes with fluctuations in VDD. The
tested absolute accuracy of the comparator voltage
reference can be found in Section 15.0 “Electrical
Specifications”.
FIGURE 7-8:
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
VRR = 1 (low range): CVREF = (VR<3:0>/24) x VDD
VRR = 0 (high range):
CVREF = (VDD/4) + (VR<3:0> x VDD/32)
VRR
8R
VR<3:0>
16-1 Analog
8R
RR
RR
CVREF to
16 Stages
Comparator
Input
VREN
VDD
MUX



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