thus, reduce code overhead.
鈥?/div>
Extended Watchdog Timer (WDT):
This
Enhanced version incorporates a 16-bit prescaler,
allowing an extended time-out range that is stable
across operating voltage and temperature. See
Section 26.0 鈥淓lectrical Characteristics鈥?/span>
for
time-out periods.
Details on Individual Family
Members
Devices in the PIC18F2525/2620/4525/4620 family are
available in 28-pin and 40/44-pin packages. Block
diagrams for the two groups are shown in Figure 1-1
and Figure 1-2.
The devices are differentiated from each other in five
ways:
1.
Flash program memory (48 Kbytes for
PIC18FX525
devices,
64 Kbytes
for
PIC18FX620).
A/D channels (10 for 28-pin devices, 13 for
40/44-pin devices).
I/O ports (3 bidirectional ports on 28-pin devices,
5 bidirectional ports on 40/44-pin devices).
CCP and Enhanced CCP implementation
(28-pin devices have 2 standard CCP
modules, 40/44-pin devices have one standard
CCP module and one ECCP module).
Parallel Slave Port (present only on 40/44-pin
devices).
2.
3.
4.
5.
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
Table 1-3.
Like all Microchip PIC18 devices, members of the
PIC18F2525/2620/4525/4620 family are available as
both standard and low-voltage devices. Standard
devices with Enhanced Flash memory, designated with
an 鈥淔鈥?in the part number (such as PIC18F2620),
accommodate an operating V
DD
range of 4.2V to 5.5V.
Low-voltage parts, designated by 鈥淟F鈥?(such as
PIC18LF2620), function over an extended V
DD
range
of 2.0V to 5.5V.
DS39626B-page 8
Preliminary
铮?/div>
2004 Microchip Technology Inc.
prev
next