PIC18F6390/6490/8390/8490
1.2
Other Special Features
1.3
•
Memory Endurance:
The Flash cells for program
memory are rated to last for approximately a
thousand erase/write cycles. Data retention
without refresh is conservatively estimated to be
greater than 100 years.
•
Extended Instruction Set:
The
PIC18F6390/6490/8390/8490 family introduces
an optional extension to the PIC18 instruction set,
which adds 8 new instructions and an Indexed
Addressing mode. This extension, enabled as a
device configuration option, has been specifically
designed to optimize re-entrant application code
originally developed in high-level languages such
as C.
•
Enhanced Addressable USART:
This serial
communication module is capable of standard
RS-232 operation and provides support for the LIN
bus protocol. Other enhancements include
Automatic Baud Rate Detection and a 16-bit Baud
Rate Generator for improved resolution. When the
microcontroller is using the internal oscillator
block, the EUSART provides stable operation for
applications that talk to the outside world, without
using an external crystal (or its accompanying
power requirement).
•
10-Bit A/D Converter:
This module incorporates
programmable acquisition time, allowing for a
channel to be selected and a conversion to be
initiated without waiting for a sampling period and
thus, reduces code overhead.
•
Extended Watchdog Timer (WDT):
This
enhanced version incorporates a 16-bit prescaler,
allowing a time-out range from 4 ms to over
10 minutes that is stable across operating voltage
and temperature.
Details on Individual Family
Members
Devices in the PIC18F6390/6490/8390/8490 family are
available in 64-pin (PIC18F6X90) and 80-pin
(PIC18F8X90) packages. Block diagrams for the two
groups are shown in Figure 1-1 and Figure 1-2,
respectively.
The devices are differentiated from each other in three
ways:
1.
2.
I/O Ports: 7 bidirectional ports on 64-pin
devices; 9 bidirectional ports on 80-pin devices.
LCD Pixels: 128 (32 SEGs x 4 COMs) pixels can
be driven by 64-pin devices; 192 (48 SEGs x
4 COMs) pixels can be driven by 80-pin devices.
Flash Program Memory: 8 Kbytes for
PIC18FX390 devices; 16 Kbytes for PIC18FX490.
3.
All other features for devices in this family are identical.
These are summarized in Table 1-1.
The pinouts for all devices are listed in Table 1-2 and
Like all Microchip PIC18 devices, members of the
PIC18F6390/6490/8390/8490 family are available as
both standard and low-voltage devices. Standard
devices with Flash memory, designated with an “F” in
the part number (such as PIC18F6390), accommodate
an operating V
DD
range of 4.2V to 5.5V. Low-voltage
parts, designated by “LF” (such as PIC18LF6490),
function over an extended V
DD
range of 2.0V to 5.5V.
DS39629C-page 8
©
2007 Microchip Technology Inc.
MICROCHIP [ MICROCHIP TECHNOLOGY ]
