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Sheet目录3841

140页 141页 142页 143页 [144页]145页 146页 147页 148页

2009 Microchip Technology Inc.

DS39636D-page 233

PIC18F2X1X/4X1X

21.0 HIGH/LOW-VOLTAGE DETECT

(HLVD)

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.

The

High/Low-Voltage

Detect

Control

(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.

REGISTER 21-1:

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

HLVDL2

HLVDL1

HLVDL0

bit 7

bit 0

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)

bit 6

Unimplemented: Read as ‘0’

bit 5

IRVST: Internal Reference Voltage Stable Flag bit

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

range

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

voltage range and the HLVD interrupt should not be enabled

bit 4

HLVDEN: High/Low-Voltage Detect Power Enable bit

1 = HLVD enabled

0 = HLVD disabled

bit 3-0

HLVDL3:HLVDL0: Voltage Detection Limit bits

1111 = External analog input is used (input comes from the HLVDIN pin)

1110 = Maximum setting

0000 = Minimum setting

Note:

See Table 25-4 in Section 25.0 “Electrical Characteristics” for the specifications.

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

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