PIC18F2331-E/ML MICROCHIP [Microchip Technology], PIC18F2331-E/ML Datasheet - Page 260

• Manufacturer Part Number: PIC18F2331-E/ML
• Description: 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F2331/2431/4331/4431
22.4
The internal reference voltage of the LVD module,
specified in electrical specification Parameter D420,
may be used by other internal circuitry, such as the
Programmable Brown-out Reset. If the LVD, 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-voltage condition can be reliably detected. This
FIGURE 22-2:
DS39616D-page 260
Internally Generated
Internally Generated
Reference Stable
Reference Stable
CASE 1:
CASE 2:
LVD Start-up Time
Enable LVD
Enable LVD
LVDIF
LVDIF
V
V
DD
DD
LOW-VOLTAGE DETECT WAVEFORMS
T
T
IRVST
IRVST
LVDIF may not be set
start-up time, T
of device clock speed. It is specified in electrical
specification Parameter 36.
The LVD 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
LVDIF cleared in software,
LVDIF remains set since LVD condition still exists
IRVST
LVDIF cleared in software
, is an interval that is independent
 2010 Microchip Technology Inc.
LVDIF cleared in software
V
V
LVD
LVD
Figure
IRVST
22-2).
has