PIC18F67K90-E/PT Microchip Technology, PIC18F67K90-E/PT Datasheet - Page 397
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PIC18F67K90-E/PT
Manufacturer Part Number
PIC18F67K90-E/PT
Description
128kB Flash, 4kB RAM, 1kB EE, NanoWatt XLP, LCD 64 TQFP 10x10x1mm TRAY
Manufacturer
Microchip Technology
Series
PIC® XLP™ 18Fr
Datasheet
1.PIC18F66K90-IMR.pdf
(570 pages)
Specifications of PIC18F67K90-E/PT
Core Processor
PIC
Core Size
8-Bit
Speed
64MHz
Connectivity
I²C, LIN, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 16x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
64-TQFP
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F67K90-E/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
- Current page: 397 of 570
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25.0
The comparator voltage reference is a 32-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
The resistor ladder is segmented to provide a range of
CV
conserve power when the reference is not being used.
The module’s supply reference can be provided from
either device V
25.1
The comparator voltage reference module is controlled
through the CVRCON register
comparator voltage reference provides a range of
output voltage with 32 levels.
The CVR<4:0> selection bits (CVRCON<4:0>) offer a
range of output voltages.
comparator voltage reference is computed.
REGISTER 25-1:
2009-2011 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
bit 6
bit 5
bit 4-0
REF
CVREN
R/W-0
values and has a power-down function to
COMPARATOR VOLTAGE
REFERENCE MODULE
Configuring the Comparator
Voltage Reference
DD
CVREN: Comparator Voltage Reference Enable bit
1 = CV
0 = CV
CVROE: Comparator V
1 = CV
0 = CV
CVRSS: Comparator V
1 = Comparator reference source: CV
0 = Comparator reference source: CV
CVR<4:0>: Comparator V
When CVRSS = 1 :
CV
When CVRSS = 0 :
CV
/V
CVROE
REF
REF
R/W-0
SS
or an external voltage reference.
CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
= (V
= (AV
REF
REF
REF
REF
Equation 25-1
REF
circuit is powered on
circuit is powered down
voltage level is output on the CV
voltage level is disconnected from the CV
SS
W = Writable bit
‘1’ = Bit is set
-) + (CVR<4:0>/32) (V
) + (CVR<4:0>/32) (AV
CVRSS
(Register
R/W-0
REF
REF
shows how the
REF
Figure
Source Selection bit
Output Enable bit
25-1). The
Value Selection (0 CVR<4:0> 31) bits
R/W-0
CVR4
25-1.
RSRC
RSRC
REF
DD
+ – V
– AV
= V
= AV
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
REF
PIC18F87K90 FAMILY
REF
R/W-0
CVR3
REF
SS
EQUATION 25-1:
The comparator reference supply voltage can come
from either V
V
voltage source is selected by the CVRSS bit
(CVRCON<5>).
The settling time of the comparator voltage reference
must be considered when changing the CV
output (see
Characteristics”
pin
DD
REF
If CVRSS = 1 :
C
If CVRSS = 0 :
C
)
+ – V
-)
VREF
VREF
– AV
- that are multiplexed with RA3 and RA2. The
REF
REF
= (V
= (AV
SS
pin
-
REF
Table 31-2
DD
SS
R/W-0
CVR2
-) + (CVR<4:0>/32) • (V
) + (CVR<4:0>/32) • (AV
and V
).
SS
in
, or the external V
x = Bit is unknown
Section 31.0 “Electrical
R/W-0
CVR1
DS39957D-page 397
REF
DD
+ – V
– AV
R/W-0
CVR0
REF
REF
SS
+ and
bit 0
)
-)
REF
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