PIC18FXX8 Datasheet, PDF (262/402 Pages) Microchip Technology – 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

PIC18FXX8
FIGURE 23-2:
LOW-VOLTAGE DETECT (LVD) BLOCK DIAGRAM
VDD
LVDIN
LVDL3:LVDL0
LVDCON
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 to one input of the comparator (Figure 23-3).
The other input is connected to the internally generated
voltage reference (parameter #D423 in Section 27.2
“DC Characteristics”). 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 23-3:
LOW-VOLTAGE DETECT (LVD) WITH EXTERNAL INPUT BLOCK DIAGRAM
VDD
VDD
LVDL3:LVDL0
LVDCON
Register
Externally Generated
Trip Point
LVDIN
LVDEN
LVD
VxEN
BODEN
EN
BGAP
DS41159D-page 260
 2004 Microchip Technology Inc.