PIC18FXX20
FIGURE 22-2:
LOW VOLTAGE DETECT (LVD) BLOCK DIAGRAM
VDD
LVDIN
LVD3:LVD0
LVDCON
Register
LVDIF
Internally Generated
Reference Voltage
(Parameter #D423)
LVDEN
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
VDD
VDD
LVD3:LVD0
LVDCON
Register
LVDIN
LVDEN
Externally Generated
Trip Point
LVD
VxEN
BODEN
EN
BGAP
DS39609A-page 234
Advance Information
2003 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
