PIC16F636TESLASHMF datasheet(73/196 Pages) MICROCHIP

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Preliminary

DS41232B-page 71

PIC12F635/PIC16F636/639

8.0

PROGRAMMABLE

LOW-VOLTAGE DETECT

(PLVD) MODULE

The Programmable Low-Voltage Detect module is an

interrupt driven supply level detection. The voltage

detection monitors the internal power supply.

8.1

Voltage Trip Points

The PIC12F635/PIC16F636/639 device supports eight

internal PLVD trip points. See Register 8-1 for available

PLVD trip point voltages.

LVDCON – LOW-VOLTAGE DETECT CONTROL REGISTER (ADDRESS: 94h)

TABLE 8-1:

REGISTERS ASSOCIATED WITH PROGRAMMABLE LOW-VOLTAGE DETECT

U-0

R-0

R/W-0

U-0

R/W-1

R/W-0

—

—IRVST

LVDEN

—

LVDL2

LVDL1

LVDL0

bit 7

bit 0

bit 7-6

Unimplemented: Read as ‘0’

bit 5

IRVST: Internal Reference Voltage Stable Status Flag bit

= Indicates that the PLVD is stable and PLVD interrupt is reliable

= Indicates that the PLVD is not stable and PLVD interrupt should not be enabled

bit 4

LVDEN: Low-Voltage Detect Power Enable bit

= Enables PLVD, powers up PLVD circuit and supporting reference circuitry

= Disables PLVD, powers down PLVD and supporting circuitry

bit 3

Unimplemented: Read as ‘0’

bit 2-0

LVDL<2:0>: Low-Voltage Detection Limit bits (nominal values)

111

= 4.5V

110

= 4.2V

101

= 4.0V

100

= 2.3V (default)

011

= 2.2V

010

= 2.1V

001

= 2.0V

000

= 1.9V(1)

Note 1: Not tested and below minimum VDD.

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

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR, BOD,

WUR

Value on

all other

Resets

94h

LVDCON

—

—IRVST

LVDEN

—

LVDL2

LVDL1

LVDL0

--00 -000

0Bh/8Bh

INTCON

GIE

PEIE

T0IE

INTE

RAIE

T0IF

INTF

RAIF

0000 0000

0Ch

PIR1

EEIF

LVDIF

CRIF

C2IF

C1IF

OSFIF

—

TMR1IF 0000 00-0 0000 00-0

8Ch

PIE1

EEIE

LVDIE

CRIE

C2IE(1)

C1IE

OSFIE

—

TMR1IE 0000 00-0 0000 00-0

Legend:

= unknown, u = unchanged, — = unimplemented, read as ‘0’. Shaded cells are not used by the comparator or

comparator voltage reference module.

Note

PIC16F636/639 only.

PIC16F636TE/MF 数据表(PDF) 73 Page - Microchip Technology

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