PIC16F610 Datasheet, PDF (71/180 Pages) Microchip Technology – 14-Pin, Flash-Based 8-Bit CMOS Microcontrollers

PIC16F610/616/16HV610/616
8.11.5 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 FVREN bit of the VRCON
register to ‘1’. This reference is always enabled when
the HFINTOSC oscillator is active.
8.11.6 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.
8.11.7 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 8-9:
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
16 Stages
VDD
CVREF
To Comparators
and ADC Module
8R
R
R
Analog
MUX
15
0
C1VREN
VR<3:0>⁽¹⁾
4
C2VREN
R
R
8R
VRR
To ADC Module
Fixed Ref
To Comparators
and ADC Module
1.2V
0.6V
EN
Fixed Voltage
Reference
FVREN
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.
© 2007 Microchip Technology Inc.
Preliminary
DS41288C-page 69