PIC18F1220_07 Datasheet, PDF (169/308 Pages) Microchip Technology – 18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers with 10-bit A/D and nanoWatt Technology

PIC18F1220/1320
18.1 Control Register
The Low-Voltage Detect Control register controls the
operation of the Low-Voltage Detect circuitry.
REGISTER 18-1:
LVDCON REGISTER
U-0
U-0
—
—
bit 7
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 = 4.04V-5.15V
1101 = 3.76V-4.79V
1100 = 3.58V-4.56V
1011 = 3.41V-4.34V
1010 = 3.23V-4.11V
1001 = 3.14V-4.00V
1000 = 2.96V-3.77V
0111 = 2.70V-3.43V
0110 = 2.53V-3.21V
0101 = 2.43V-3.10V
0100 = 2.25V-2.86V
0011 = 2.16V-2.75V
0010 = 1.99V-2.53V
0001 = Reserved
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
© 2007 Microchip Technology Inc.
DS39605F-page 167