PIC18F2331 Datasheet, PDF (264/396 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D

PIC18F2331/2431/4331/4431
FIGURE 21-2:
LOW-VOLTAGE DETECT (LVD) BLOCK DIAGRAM
VDD
LVDIN
LVD Control
Register
LVDIF
LVDEN
Internally Generated
Reference Voltage
1.2V
The LVD module has an additional feature that allows
the user to supply the sense voltage to the module
from an external source. This mode is enabled when
bits LVDL3:LVDL0 are set to ‘1111’. In this state, the
comparator input is multiplexed from the external input
pin, LVDIN (Figure 21-3). This gives users flexibility,
because it allows them to configure the low-voltage
detect interrupt to occur at any voltage in the valid
operating range.
FIGURE 21-3:
LOW-VOLTAGE DETECT (LVD) WITH EXTERNAL INPUT BLOCK DIAGRAM
VDD
VDD
LVD Control
Register
Externally Generated
Trip Point
LVDIN
LVDEN
LVD
VxEN
BODEN
EN
BGAP
DS39616B-page 262
Preliminary
 2003 Microchip Technology Inc.