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PIC16F616-E/ML Datasheet(PDF) 63 Page - Cirrus Logic

Part # PIC16F616-E/ML
Description  14-Pin Flash-Based, 8-Bit CMOS Microcontrollers
PDF  172 Pages
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Manufacturer  APEX [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo APEX - Cirrus Logic

PIC16F616-E/ML Datasheet(HTML) 63 Page - Cirrus Logic

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© 2006 Microchip Technology Inc.
Preliminary
DS41288A-page 61
PIC16F616/16HV616
8.10.5
FIXED VOLTAGE REFERENCE
The fixed voltage reference is independent of VDD, with
a nominal output voltage of 0.6V. This reference can be
enabled by setting the VP6EN bit of the VRCON
register to ‘1’.
8.10.6
FIXED VOLTAGE REFERENCE
STABILIZATION PERIOD
When the fixed voltage reference module is enabled, it
will require some time for the reference and its amplifier
circuits to stabilize. The user program must include a
small delay routine to allow the module to settle. See
the electrical specifications section for the minimum
delay requirement.
8.10.7
VOLTAGE REFERENCE
SELECTION
Multiplexers on the output of the voltage reference
module enable selection of either the CVREF or fixed
voltage reference for use by the comparators.
Setting the C1VREN bit of the VRCON register enables
current to flow in the CVREF voltage divider and selects
the CVREF voltage for use by C1. Clearing the C1VREN
bit selects the fixed voltage for use by C1.
Setting the C2VREN bit of the VRCON register enables
current to flow in the CVREF voltage divider and selects
the CVREF voltage for use by C2. Clearing the C2VREN
bit selects the fixed voltage for use by C2.
When both the C1VREN and C2VREN bits are cleared,
current flow in the CVREF voltage divider is disabled
minimizing the power drain of the voltage reference
peripheral.
FIGURE 8-8:
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
VRR
8R
VR<3:0>(1)
Analog
8R
RR
RR
16 Stages
VDD
MUX
Fixed Voltage
C2VREN
C1VREN
CVREF
Reference
EN
VP6EN
0.6V
FixedRef
To Comparators
and ADC Module
To Comparators
and ADC Module
Note 1:
Care should be taken to ensure VREF remains
within the comparator common mode input range.
See Section 15.0 “Electrical Specifications” for
more detail.
4
15
0



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