PIC16F616 Microchip Technology Inc., PIC16F616 Datasheet - Page 71

• Manufacturer Part Number: PIC16F616
• Description: 14-pin Flash-based, 8-bit Cmos Microcontrollers
• Manufacturer: Microchip Technology Inc.

8.11.5
The fixed voltage reference is independent of V
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
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.
FIGURE 8-9:
© 2007 Microchip Technology Inc.
To Comparators
and ADC Module
V
CV
DD
REF
To Comparators
and ADC Module
FIXED VOLTAGE REFERENCE
FIXED VOLTAGE REFERENCE
STABILIZATION PERIOD
To ADC Module
Fixed Ref
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
C2VREN
C1VREN
8R
15
Analog
0
MUX
4
0.6V
R
1.2V
VR<3:0>
PIC16F610/616/16HV610/616
DD
, with
Fixed Voltage
Preliminary
(1)
Reference
R
EN
16 Stages
Note 1: Care should be taken to ensure V
8.11.7
Multiplexers on the output of the voltage reference
module enable selection of either the CV
voltage reference for use by the comparators.
Setting the C1VREN bit of the VRCON register enables
current to flow in the CV
the CV
bit selects the fixed voltage for use by C1.
Setting the C2VREN bit of the VRCON register enables
current to flow in the CV
the CV
bit selects the fixed voltage for use by C2.
When both the C1VREN and C2VREN bits are cleared,
current flow in the CV
minimizing the power drain of the voltage reference
peripheral.
REF
REF
R
within the comparator common mode input range.
See Section 15.0 “Electrical Specifications” for
more detail.
voltage for use by C1. Clearing the C1VREN
voltage for use by C2. Clearing the C2VREN
VOLTAGE REFERENCE
SELECTION
R
FVREN
REF
REF
REF
voltage divider is disabled
voltage divider and selects
voltage divider and selects
8R
DS41288C-page 69
REF
REF
remains
V
or fixed
RR