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Sheet目录3872

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PIC18F2450/4450

2006 Microchip Technology Inc.

Advance Information

DS39760A-page 183

17.0

HIGH/LOW-VOLTAGE DETECT

(HLVD)

PIC18F2450/4450 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

interrupt vector address and the software can then

respond to the interrupt.

The

High/Low-Voltage

Detect

Control

(Register 17-1) 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 17-1.

REGISTER 17-1:

HLVDCON: HIGH/LOW-VOLTAGE DETECT CONTROL REGISTER

R/W-0

U-0

R-0

R/W-0

R/W-1

R/W-0

R/W-1

VDIRMAG

—

IRVST

HLVDEN

HLVDL3(1)

HLVDL2(1)

HLVDL1(1)

HLVDL0(1)

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

VDIRMAG: Voltage Direction Magnitude Select bit

= Event occurs when voltage equals or exceeds trip point (HLVDL3:HLDVL0)

= Event occurs when voltage equals or falls below trip point (HLVDL3:HLVDL0)

bit 6

Unimplemented: Read as ‘0’

bit 5

IRVST: Internal Reference Voltage Stable Flag bit

= Indicates that the voltage detect logic will generate the interrupt flag at the specified voltage

trip point

= Indicates that the voltage detect logic will not generate the interrupt flag at the specified voltage

trip point and the LVD interrupt should not be enabled

bit 4

HLVDEN: High/Low-Voltage Detect Power Enable bit

= HLVD enabled

= HLVD disabled

bit 3-0

HLVDL3:HLVDL0: Voltage Detection Limit bits(1)

1111

= Reserved

1110

= Maximum setting

0000

= Minimum setting

Note 1:

See Table 21-4 in Section 21.0 “Electrical Characteristics” for specifications.

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