PIC18F2510 MICROCHIP [Microchip Technology], PIC18F2510 Datasheet - Page 233
PIC18F2510
Manufacturer Part Number
PIC18F2510
Description
28/40/44-PIN FLASH MICROCONTROLLERS WITH 10-BIT A/D AND NANO WATT TECHNOLOGY
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F2510.pdf
(380 pages)
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21.0
PIC18F2X1X/4X1X devices have a High/Low-Voltage
Detect module (HLVD). This is a programmable circuit
that allows the user to specify both a device voltage trip
point and the direction of change from that point. If the
device experiences an excursion past the trip point in
that direction, an interrupt flag is set. If the interrupt is
enabled, the program execution will branch to the inter-
rupt vector address and the software can then respond
to the interrupt.
REGISTER 21-1:
2004 Microchip Technology Inc.
HIGH/LOW-VOLTAGE DETECT
(HLVD)
bit 7
bit 6
bit 5
bit 4
bit 3-0
HLVDCON: HIGH/LOW-VOLTAGE DETECT CONTROL REGISTER
bit 7
VDIRMAG: Voltage Direction Magnitude Select bit
1 = Event occurs when voltage equals or exceeds trip point (HLVDL3:HLDVL0)
0 = Event occurs when voltage equals or falls below trip point (HLVDL3:HLVDL0)
Unimplemented: Read as ‘0’
IRVST: Internal Reference Voltage Stable Flag bit
1 = Indicates that the voltage detect logic will generate the interrupt flag at the specified voltage
0 = Indicates that the voltage detect logic will not generate the interrupt flag at the specified
HLVDEN: High/Low-Voltage Detect Power Enable bit
1 = HLVD enabled
0 = HLVD disabled
HLVDL3:HLVDL0: Voltage Detection Limit bits
1111 = External analog input is used (input comes from the HLVDIN pin)
1110 = Maximum setting
.
.
.
0000 = Minimum setting
VDIRMAG
Legend:
R = Readable bit
-n = Value at POR
R/W-0
Note:
range
voltage range and the HLVD interrupt should not be enabled
See Table 25-4 in Section 25.0 “Electrical Characteristics” for the specifications.
U-0
—
IRVST
R-0
W = Writable bit
‘1’ = Bit is set
HLVDEN
R/W-0
The
(Register 21-1) completely controls the operation of the
HLVD module. This allows the circuitry to be “turned
off” by the user under software control, which
minimizes the current consumption for the device.
The block diagram for the HLVD module is shown in
Figure 21-1.
PIC18F2X1X/4X1X
High/Low-Voltage
HLVDL3
R/W-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
HLVDL2
R/W-1
Detect
HLVDL1
x = Bit is unknown
R/W-0
DS39636A-page 231
Control
HLVDL0
R/W-1
register
bit 0
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