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PIC12F635ESS датащи(PDF) 86 Page - Microchip Technology

номер детали PIC12F635ESS
подробное описание детали  PIC12F635/PIC16F636/639 Data Sheet
PDF  234 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC12F635ESS датащи(HTML) 86 Page - Microchip Technology

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PIC12F635/PIC16F636/639
DS41232D-page 84
© 2007 Microchip Technology Inc.
FIGURE 7-10:
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
REGISTER 7-5:
VRCON: VOLTAGE REFERENCE CONTROL REGISTER
R/W-0
U-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
VREN
—VRR
—
VR3
VR2
VR1
VR0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
VREN: CVREF Enable bit
1
= CVREF circuit powered on
0
= CVREF circuit powered down, no IDD drain and CVREF = VSS.
bit 6
Unimplemented: Read as ‘0’
bit 5
VRR: CVREF Range Selection bit
1
= Low range
0
= High range
bit 4
Unimplemented: Read as ‘0’
bit 3-0
VR<3:0>: CVREF Value Selection bits (0
≤ VR<3:0> ≤ 15)
When VRR = 1: CVREF = (VR<3:0>/24) * VDD
When VRR = 0: CVREF = VDD/4 + (VR<3:0>/32) * VDD
VRR
8R
VR<3:0>(1)
16-1 Analog
8R
R
R
R
R
CVREF to
16 Stages
Comparator
Input
VREN
VDD
MUX
VR<3:0> = 0000
VREN
VRR
0
1
2
14
15
Note 1:
Care should be taken to ensure VREF remains
within the comparator common mode input
range. See Section 15.0 “Electrical Specifica-
tions” for more detail.



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