PIC18LF6310T-I/PT Microchip Technology, PIC18LF6310T-I/PT Datasheet - Page 271

• Manufacturer Part Number: PIC18LF6310T-I/PT
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,TQFP,64PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18LF6310T-I/PT

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

22.0
The comparator voltage reference is a 16-tap resistor
ladder network that provides a selectable reference
voltage. Although its primary purpose is to provide a
reference for the analog comparators, it may also be
used independently of them.
A block diagram is of the module shown in
The resistor ladder is segmented to provide two ranges
of CV
conserve power when the reference is not being used.
The module’s supply reference can be provided from
either device V
reference.
22.1
The voltage reference module is controlled through the
CVRCON register
Voltage Reference provides two ranges of output
REGISTER 22-1:
 2010 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
bit 6
bit 5
bit 4
bit 3-0
Note 1:
CVREN
R/W-0
REF
COMPARATOR VOLTAGE
REFERENCE MODULE
Configuring the Comparator
Voltage Reference
values and has a power-down function to
CVROE overrides the TRISF<5> bit setting if enabled for output; RF5 must also be configured as an input
by setting TRISF<5> to ‘1’.
CVREN: Comparator Voltage Reference Enable bit
1 = CV
0 = CV
CVROE: Comparator V
1 = CV
0 = CV
CVRR: Comparator V
1 = 0 CV
0 = 0.25 CV
CVRSS: Comparator V
1 = Comparator reference source, CV
0 = Comparator reference source, CV
CVR<3:0>: Comparator V
When CVRR = 1:
CV
When CVRR = 0:
CV
CVROE
DD
REF
REF
R/W-0
(Register
/V
CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
SS
REF
REF
REF
REF
= ((CVR<3:0>)/24)  (CV
= (CV
, or an external voltage
RSRC
(1)
circuit powered on
circuit powered down
voltage level is also output on the RF5/AN10/CV
voltage is disconnected from the RF5/AN10/CV
RSRC
RSRC
22-1). The Comparator
W = Writable bit
‘1’ = Bit is set
to 0.667 CV
to 0.75 CV
R/W-0
CVRR
/4) + ((CVR<3:0>)/32)  (CV
REF
REF
REF
Figure
Range Selection bit
REF
RSRC
Source Selection bit
Output Enable bit
RSRC
PIC18F6310/6410/8310/8410
Value Selection bits (0  (CVR<3:0>)  15)
CVRSS
, with CV
RSRC
R/W-0
22-1.
, with CV
)
RSRC
RSRC
RSRC
RSRC
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
= (V
= V
(1)
/24 step size
R/W-0
RSRC
CVR3
voltage, each with 16 distinct levels. The range to be
used is selected by the CVRR bit (CVRCON<5>). The
primary difference between the ranges is the size of the
steps
(CVR<3:0>), with one range offering finer resolution.
The equations used to calculate the output of the
Comparator Voltage Reference are as follows:
The comparator reference supply voltage can come
from either V
V
voltage source is selected by the CVRSS bit
(CVRCON<4>).
The settling time of the comparator voltage reference
must be considered when changing the CV
output (see
Characteristics”).
DD
/32 step size
REF
REF
– V
If CVRR = 1:
CV
If CVRR = 0:
CV
+) – (V
)
- that are multiplexed with RA2 and RA3. The
REF
REF
SS
selected
= (CV
= ((CVR<3:0>)/24) x CV
REF
REF
REF
DD
Table 27-3
R/W-0
CVR2
-)
pin
DD
pin
and V
by
x 1/4) + (((CVR<3:0>)/32) x CV
SS
the
in
, or the external V
x = Bit is unknown
Section 27.0 “Electrical
R/W-0
CVR1
CV
REF
RSRC
DS39635C-page 271
selection
R/W-0
CVR0
REF
+ and
RSRC
bit 0
REF
bits
)