PIC18F64J11T-I/PT Microchip Technology, PIC18F64J11T-I/PT Datasheet - Page 276

• Manufacturer Part Number: PIC18F64J11T-I/PT
• Description: 16KB, Flash, 1024bytes-RAM, 51I/O, 8-bit Family,nanoWatt 64 TQFP 10x10x1mm T/R
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F64J11T-I/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 51
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 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
• For Use With: MA180018 - MODULE PLUG-IN 18F85J11AC162079 - HEADER MPLAB ICD2 18F85J90 64/80AC164327 - MODULE SKT FOR 64TQFP
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PIC18F64J11T-I/PTTR

PIC18F85J11 FAMILY
FIGURE 22-1:
22.2
The full range of comparator voltage reference cannot
be realized due to the construction of the module. The
transistors on the top and bottom of the resistor ladder
network (Figure 22-1) keep CV
reference source rails. The voltage reference is derived
from the reference source; therefore, the CV
changes with fluctuations in that source. The tested
absolute accuracy of the voltage reference can be found
in Section 26.0 “Electrical Characteristics”.
22.3
When the device wakes up from Sleep through an
interrupt or a Watchdog Timer time-out, the contents of
the CVRCON register are not affected. To minimize
current consumption in Sleep mode, the comparator
voltage reference should be disabled.
DS39774D-page 276
Comparator Voltage Reference
Accuracy/Error
Operation During Sleep
V
V
CVREN
CVRR
V
REF
REF
DD
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
+
-
CVRSS = 1
CVRSS = 0
REF
from approaching the
CVRSS = 1
CVRSS = 0
16 Steps
REF
output
8R
R
R
R
R
R
R
R
capability, a buffer must be used on the comparator volt-
22.4
A device Reset disables the comparator voltage
reference by clearing bit, CVREN (CVRCON<7>). This
Reset also disconnects the reference from the RA2 pin
by clearing bit, CVROE (CVRCON<6>) and selects the
high-voltage
(CVRCON<5>). The CVR<3:0> value select bits are
also cleared.
22.5
The comparator voltage reference module operates
independently of the comparator module. The output of
the reference generator may be connected to the RF5
pin if the CVROE bit is set. Enabling the voltage refer-
ence output onto RA2 when it is configured as a digital
input will increase current consumption. Connecting
RF5 as a digital output with CVRSS enabled will also
increase current consumption.
The RF5 pin can be used as a simple D/A output with
limited drive capability. Due to the limited current drive
age reference output for external connections to V
Figure 22-2 shows an example buffering technique.
8R
Effects of a Reset
Connection Considerations
CVR<3:0>
range
 2010 Microchip Technology Inc.
by
CV
clearing
REF
bit,
CVRR
REF
.