PIC18F6390 Datasheet, PDF (9/412 Pages) Microchip Technology – 64/80-Pin Flash Microcontrollers with LCD Driver and nanoWatt Technology

PIC18F6390/6490/8390/8490
1.0 DEVICE OVERVIEW
This document contains device specific information for
the following devices:
• PIC18F6390
• PIC18F6490
• PIC18F8390
• PIC18F8490
This family offers the advantages of all PIC18
microcontrollers – namely, high computational
performance at an economical price. In addition to
these features, the PIC18F6390/6490/8390/8490
family introduces design enhancements that make
these microcontrollers a logical choice for many
high-performance, power sensitive applications.
1.1 New Core Features
1.1.1 nanoWatt TECHNOLOGY
All of the devices in the PIC18F6390/6490/8390/8490
family incorporate a range of features that can
significantly reduce power consumption during
operation. Key items include:
• Alternate Run Modes: By clocking the controller
from the Timer1 source or the internal oscillator
block, power consumption during code execution
can be reduced by as much as 90%.
• Multiple Idle Modes: The controller can also run
with its CPU core disabled, but the peripherals still
active. In these states, power consumption can be
reduced even further – to as little as 4% of normal
operation requirements.
• On-the-Fly Mode Switching: The power
managed modes are invoked by user code during
operation, allowing the user to incorporate
power-saving ideas into their application’s
software design.
• Lower Consumption in Key Modules: The
power requirements for both Timer1 and the
Watchdog Timer have been reduced by up to
80%, with typical values of 1.1 µA and 2.1 µA,
respectively.
1.1.2
MULTIPLE OSCILLATOR OPTIONS
AND FEATURES
All of the devices in the PIC18F6390/6490/8390/8490
family offer nine different oscillator options, allowing
users a wide range of choices in developing application
hardware. These include:
• Four Crystal modes, using crystals or ceramic
resonators.
• Two External Clock modes, offering the option of
using two pins (oscillator input and a divide-by-4
clock output) or one pin (oscillator input, with the
second pin reassigned as general I/O).
• Two External RC Oscillator modes, with the same
pin options as the External Clock modes.
• An internal oscillator block which provides an
8 MHz clock (±2% accuracy) and an INTRC
source (approximately 31 kHz, stable over
temperature and VDD), as well as a range of six
user selectable clock frequencies between
125 kHz to 4 MHz for a total of eight clock
frequencies. This option frees the two oscillator
pins for use as additional general purpose I/O.
• A Phase Lock Loop (PLL) frequency multiplier,
available to both the High-Speed Crystal and
Internal Oscillator modes, which allows clock
speeds of up to 40 MHz. Used with the internal
oscillator, the PLL gives users a complete
selection of clock speeds from 31 kHz to 32 MHz
– all without using an external crystal or clock
circuit.
Besides its availability as a clock source, the internal
oscillator block provides a stable reference source that
gives the family additional features for robust
operation:
• Fail-Safe Clock Monitor: This option constantly
monitors the main clock source against a
reference signal provided by the internal
oscillator. If a clock failure occurs, the controller is
switched to the internal oscillator block, allowing
for continued low-speed operation or a safe
application shutdown.
• Two-Speed Start-up: This option allows the
internal oscillator to serve as the clock source
from Power-on Reset or wake-up from Sleep
mode until the primary clock source is available.
 2004 Microchip Technology Inc.
Preliminary
DS39629B-page 7