PIC16HV540 datasheet(3/36 Pages) MICROCHIP

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Preliminary

DS40197A-page 3

PIC16HV540

1.2.7

ENHANCED WATCHDOG TIMER (WDT)

OPERATION

The WDT is enabled by setting FUSE 2 in the conﬁguration

word. The WDT setting is latched and the fuse disabled

during SLEEP mode to reduce current consumption.

If the WDT is disabled by FUSE 2, it can be enabled/dis-

abled under program control using bit 4 in OPTION2

(SWE).The software WDT control is disabled at power-up.

The current consumption of the on-chip oscillator (used

for the watchdog, oscillator startup timer and sleep

timer) is less than 1

µA (typical) at 3 Volt operation.

1.2.8

REDUCED EXTERNAL RC OSCILLATOR

STARTUP TIME

If the RC oscillator option is selected in the Conﬁgura-

tion word (FOSC1=1 and FOSCO=1) the oscillator

startup time is 1.0 ms nominal instead of 18 ms nomi-

nal. This is applicable after power-up (POR), either

WDT interrupt or wake-up, external reset on MCLR,

WPC (wake on pin change) and Brown-out.

1.2.9

LOW-VOLTAGE OPERATION OF THE

ENTIRE CPU DURING SLEEP

The voltage regulator can automatically lower the volt-

age to the core from 5 Volt to 3 Volt during sleep, result-

ing in reduced current consumption. This is an option

bit in OPTION2 register.

1.2.10

GLITCH FILTERS ON WAKEUP PINS AND

MCLR

Glitch sensitive inputs for wakeup on pin change are ﬁl-

tered to reduce susceptibility to interference. A similar

ﬁlter reduces false reset on MCLR.

1.2.11

PROGRAMMABLE CLOCK GENERATOR

When used in RC mode the CLKOUT pin can be used

as a programmable clock output. The output is con-

nected to TMR0, bit 0 and by setting the prescaler,

clock out frequencies of CLKIN/8 to CLKIN/1024 can

be generated. The CLKOUT pin can also be used as a

general purpose output by modifying to TMR0, bit 0.

TABLE 1-1:

PIC16HV540 DEVICE

PIC16HV540

Clock

Maximum Frequency (MHz)

Memory

EPROM Program Memory

512

RAM Data Memory (bytes)

Peripherals

Timer Module(s)

TMR0

Packages

I/O Pins

Voltage Range (Volts)

3.5V-15V

Number of Instructions

Packages

18-pin DIP

SOIC

20-pin SSOP

All PICmicro® devices have Power-on Reset, selectable

WDT, selectable code protect and high I/O current capability.

2.0

PIC16HV540 DEVICE

VARIETIES

A variety of frequency ranges and packaging options

are available. When placing orders, please use the

PIC16HV540 Product Identiﬁcation System at the back

of this data sheet to specify the correct part number.

2.1

UV Erasable Devices

The UV erasable versions, offered in CERDIP pack-

ages, are optimal for prototype development and pilot

programs.

UV erasable devices can be programmed for any of the

four oscillator conﬁgurations. Microchip's PICSTART®

and PRO MATE® programmers both support program-

ming of the PIC16HV540. Third party programmers

also are available; refer to Literature Number DS00104

for a list of sources.

2.2

One-Time-Programmable (OTP)

Devices

The availability of OTP devices is especially useful for

customers expecting frequent code changes and

updates.

The OTP devices, packaged in plastic packages, per-

mit the user to program them once. In addition to the

program memory, the conﬁguration bits must be pro-

grammed.

2.3

Quick-Turnaround-Production (QTP)

Devices

Microchip offers a QTP Programming Service for fac-

tory production orders. This service is made available

for users who choose not to program a medium to high

quantity of units and whose code patterns have stabi-

lized. The devices are identical to the OTP devices but

with all EPROM locations and conﬁguration bit options

already programmed by the factory. Certain code and

prototype veriﬁcation procedures apply before produc-

tion shipments are available. Please contact your

Microchip Technology sales ofﬁce for more details.

2.4

Serialized

Quick-Turnaround-Production

(SQTP) Devices

Microchip offers the unique programming service where

a few user-deﬁned locations in each device are pro-

grammed with different serial numbers. The serial num-

bers may be random, pseudo-random or sequential.

Serial programming allows each device to have a

unique number which can serve as an entry code,

password or ID number.

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