PIC18LF8490-I/PT Microchip Technology, PIC18LF8490-I/PT Datasheet - Page 249

• Manufacturer Part Number: PIC18LF8490-I/PT
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,TQFP,80PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18LF8490-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, LCD, POR, PWM, WDT
• Number Of I /o: 66
• Program Memory Size: 16KB (8K 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: 80-TFQFP
• Processor Series: PIC18LF
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: SPI, I2C, EUSART, AUSART
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 66
• Number Of Timers: 1 x 8
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, ICE4000, DV164136, DM163028
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

20.0
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 of the module is shown in Figure 20-1.
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.
20.1
The voltage reference module is controlled through the
CVRCON register (Register 20-1). The comparator
voltage reference provides two ranges of output
voltage, each with 16 distinct levels. The range to be
REGISTER 20-1:
© 2007 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 = 0.00 CV
0 = 0.25 CV
CVRSS: Comparator V
1 = Comparator reference source, CV
0 = Comparator reference source, CV
CVR3:CVR0: Comparator V
When CVRR = 1:
CV
When CVRR = 0:
CV
CVROE
DD
REF
REF
R/W-0
/V
CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
SS
= ((CVR3:CVR0)/24) • (CV
= (CV
REF
REF
REF
REF
(1)
, or an external voltage
voltage is disconnected from the RF5/AN10/CV
circuit powered on
circuit powered down
voltage level is also output on the RF5/AN10/CV
RSRC
RSRC
RSRC
W = Writable bit
‘1’ = Bit is set
to 0.75 CV
to 0.75 CV
R/W-0
CVRR
/4) + ((CVR3:CVR0)/32) • (CV
REF
REF
REF
Range Selection bit
Source Selection bit
Output Enable bit
REF
RSRC
RSRC
PIC18F6390/6490/8390/8490
CVRSS
Value Selection bits (0 ≤ (CVR3:CVR0) ≤ 15)
R/W-0
, with CV
, with CV
RSRC
RSRC
RSRC
)
RSRC
RSRC
= (V
= V
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
(1)
R/W-0
/24 step size
/32 step size
DD
CVR3
used is selected by the CVRR bit (CVRCON<5>). The
primary difference between the ranges is the size of the
steps
(CVR3:CVR0), 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 Table 26-3 in Section 26.0 “Electrical
Characteristics”).
REF
RSRC
REF
– V
+) – (V
If CVRR = 1:
CV
If CVRR = 0:
CV
CV
- that are multiplexed with RA2 and RA3. The
)
SS
REF
REF
RSRC
selected
REF
REF
= ((CVR3:CVR0)/24) x CV
= (CV
REF
)
DD
-)
R/W-0
CVR2
/SEG23 pin
/SEG23 pin
and V
DD
by
x 1/4) + (((CVR3:CVR0)/32) x
SS
the
, or the external V
x = Bit is unknown
R/W-0
CVR1
CV
REF
DS39629C-page 247
RSRC
selection
R/W-0
CVR0
REF
+ and
bit 0
REF
bits