PIC18F4539 Datasheet, PDF (193/322 Pages) Microchip Technology – Enhanced FLASH Microcontrollers with Single Phase Induction Motor Control Kernel

PIC18FXX39
19.1 Control Register
The Low Voltage Detect Control register controls the
operation of the Low Voltage Detect circuitry.
REGISTER 19-1: LVDCON REGISTER
U-0
—
bit 7
U-0
R-0
—
IRVST
R/W-0
LVDEN
R/W-0
LVDL3
R/W-1
LVDL2
R/W-0
LVDL1
R/W-1
LVDL0
bit 0
bit 7-6
bit 5
bit 4
bit 3-0
Unimplemented: Read as '0'
IRVST: Internal Reference Voltage Stable Flag bit
1 = Indicates that the Low Voltage Detect logic will generate the interrupt flag at the
specified voltage range
0 = Indicates that the Low Voltage Detect logic will not generate the interrupt flag at the
specified voltage range and the LVD interrupt should not be enabled
LVDEN: Low Voltage Detect Power Enable bit
1 = Enables LVD, powers up LVD circuit
0 = Disables LVD, powers down LVD circuit
LVDL3:LVDL0: Low Voltage Detection Limit bits
1111 = External analog input is used (input comes from the LVDIN pin)
1110 = 4.5V - 4.77V
1101 = 4.2V - 4.45V
1100 = 4.0V - 4.24V
1011 = 3.8V - 4.03V
1010 = 3.6V - 3.82V
1001 = 3.5V - 3.71V
1000 = 3.3V - 3.50V
0111 = 3.0V - 3.18V
0110 = 2.8V - 2.97V
0101 = 2.7V - 2.86V
0100 = 2.5V - 2.65V
0011 = 2.4V - 2.54V
0010 = 2.2V - 2.33V
0001 = 2.0V - 2.12V
0000 = Reserved
Note:
LVDL3:LVDL0 modes, which result in a trip point below the valid operating voltage
of the device, are not tested.
Legend:
R = Readable bit
- n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
 2002 Microchip Technology Inc.
Preliminary
DS30485A-page 191