PIC18F23K22-ESLASHML datasheet(343/496 Pages) MICROCHIP

343 / 496 page

 2010 Microchip Technology Inc.

Preliminary

DS41412C-page 343

PIC18(L)F2X/4XK22

23.0 HIGH/LOW-VOLTAGE DETECT

(HLVD)

The PIC18(L)F2X/4XK22 devices have a High/Low-Volt-

age Detect module (HLVD). This is a programmable cir-

cuit that sets both a device voltage trip point and the

direction of change from that point. If the device experi-

ences an excursion past the trip point in that direction, an

interrupt flag is set. If the interrupt is enabled, the pro-

gram execution branches to the interrupt vector address

and the software responds to the interrupt.

The

High/Low-Voltage

Detect

Control

(Register 23-1) 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 module’s block diagram is shown in Figure 23-1.

HLVDCON: HIGH/LOW-VOLTAGE DETECT CONTROL REGISTER

R/W-0

R-0

R/W-0

R/W-1

R/W-0

R/W-1

VDIRMAG

BGVST

IRVST

HLVDEN

HLVDL<3:0>

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

1 = Event occurs when voltage equals or exceeds trip point (HLVDL<3:0>)

0 = Event occurs when voltage equals or falls below trip point (HLVDL<3:0>)

bit 6

BGVST: Band Gap Reference Voltages Stable Status Flag bit

1 = Internal band gap voltage references are stable

0 = Internal band gap voltage reference is not stable

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

HLVDL<3:0>: Voltage Detection Level bits(1)

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

1110 = Maximum setting

0000 = Minimum setting

Note 1:

See Table 27-4 for specifications.

PIC18F23K22-E/ML Datasheet(PDF) 343 Page - Microchip Technology

PIC18F23K22-E/ML Datasheet(HTML) 343 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL