
PIC18FXX39
DS30485A-page 190
Preliminary
2002 Microchip Technology Inc.
FIGURE 19-2:
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,
because it allows them to configure the Low Voltage
Detect interrupt to occur at any voltage in the valid
operating range.
FIGURE 19-3:
LOW VOLTAGE DETECT (LVD) WITH EXTERNAL INPUT BLOCK DIAGRAM
LVDIF
VDD
16
t
o
1
MUX
LVDEN
LVD Control
Register
Internally Generated
Reference Voltage
LVDIN
1.2V Typical
–
+
LVD
EN
LVD Control
16
t
o
1
M
U
X
BGAP
BODEN
LVDEN
VxEN
LVDIN
Register
VDD
Externally Generated
Trip Point
–
+