PIC18F4539 Datasheet, PDF (192/322 Pages) Microchip Technology – Enhanced FLASH Microcontrollers with Single Phase Induction Motor Control Kernel

PIC18FXX39
FIGURE 19-2:
LOW VOLTAGE DETECT (LVD) BLOCK DIAGRAM
VDD
LVDIN
LVD Control
Register
–
+
LVDIF
LVDEN
Internally Generated
Reference Voltage
1.2V Typical
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 19-3). 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 19-3:
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
DS30485A-page 190
Preliminary
 2002 Microchip Technology Inc.