PIC18F25J50 MICROCHIP [Microchip Technology], PIC18F25J50 Datasheet - Page 397
PIC18F25J50
Manufacturer Part Number
PIC18F25J50
Description
28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F25J50.pdf
(562 pages)
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25.2
To set up the HLVD module:
1.
2.
3.
4.
5.
6.
25.3
When the module is enabled, the HLVD comparator
and voltage divider are enabled and will consume static
current. The total current consumption, when enabled,
is specified in electrical specification Parameter D022B
(I
Down and Supply Current PIC18F46J50 Family
(Industrial)”).
Depending on the application, the HLVD module does
not need to operate constantly. To decrease the current
requirements, the HLVD circuitry may only need to be
enabled for short periods where the voltage is checked.
After doing the check, the HLVD module may be
disabled.
2011 Microchip Technology Inc.
HLVD
Disable the module by clearing the HLVDEN bit
(HLVDCON<4>).
Write the value to the HLVDL<3:0> bits that
selects the desired HLVD trip point.
Set the VDIRMAG bit to detect one of the
following:
• High voltage (VDIRMAG = 1)
• Low voltage (VDIRMAG = 0)
Enable the HLVD module by setting the
HLVDEN bit.
Clear the HLVD Interrupt Flag, HLVDIF
(PIR2<2>), which may have been set from a
previous interrupt.
If interrupts are desired, enable the HLVD inter-
rupt by setting the HLVDIE and GIE/GIEH bits
(PIE2<2> and INTCON<7>).
An interrupt will not be generated until the
IRVST bit is set.
)
HLVD Setup
Current Consumption
(Section 30.2 “DC Characteristics: Power-
PIC18F46J50 FAMILY
25.4
The internal reference voltage of the HLVD module,
specified in electrical specification Parameter D420 (see
Table 30-8
tics”), may be used by other internal circuitry, such as
the programmable Brown-out Reset (BOR).
If the HLVD, or other circuits using the voltage
reference, are disabled to lower the device’s current
consumption, the reference voltage circuit will require
time to become stable before a low or high-voltage con-
dition can be reliably detected. This start-up time,
T
clock speed. It is specified in electrical specification
Parameter 36
The HLVD interrupt flag is not enabled until T
expired and a stable reference voltage is reached. For
this reason, brief excursions beyond the set point may
not be detected during this interval. Refer to
or
IRVST
Figure
, is an interval that is independent of device
HLVD Start-up Time
25-3.
in
(Table
Section 30.0 “Electrical Characteris-
30-13).
DS39931D-page 397
Figure 25-2
IRVST
has
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