Datasheet

PIC18F6520/8520/6620/8620/6720/8720
DS39609C-page 234  2003-2013 Microchip Technology Inc.
FIGURE 22-2: LOW-VOLTAGE DETECT (LVD) BLOCK DIAGRAM
The LVD module has an additional feature that allows
the user to supply the trip voltage to the module from
an external source. This mode is enabled when bits
LVDL3:LVDL0 are set to ‘1111’. In this state, the com-
parator input is multiplexed from the external input pin,
LVDIN (Figure 22-3). 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 22-3: LOW-VOLTAGE DETECT (LVD) WITH EXTERNAL INPUT BLOCK DIAGRAM
LVDIF
VDD
16 to 1 MUX
LVDEN
LVDCON
Internally Generated
Reference Voltage
LVDIN
(Parameter #D423)
LVD3:LVD0
Register
LVD
EN
16 to 1 MUX
BGAP
BODEN
LVDEN
VxEN
LVDIN
VDD
VDD
Externally Generated
Trip Point
LVD3:LVD0
LVDCON
Register