PIC16HV540-04SLASHSS datasheet(2/36 Pages) MICROCHIP

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PIC16HV540

DS40197A-page 2

Preliminary

1.0

GENERAL DESCRIPTION

The PIC16HV540 from Microchip Technology is a

low-cost,

high-performance,

8-bit,

fully-static,

EPROM-based CMOS microcontroller. It is pin and soft-

ware compatible with the PIC16C5X family of devices. It

employs a RISC architecture with only 33 single word/sin-

gle cycle instructions. All instructions are single cycle

except for program branches which take two cycles. The

PIC16HV540 delivers performance an order of magnitude

higher than its competitors in the same price category.The

12-bit wide instructions are highly orthogonal resulting in

2:1 code compression over other 8-bit microcontrollers in

its class. The easy-to-use and easy-to-remember instruc-

tion set reduces development time signiﬁcantly.

The PIC16HV540 is the ﬁrst One-Time-Programmable

(OTP) microcontroller with an on-chip 3 Volt and 5 Volt reg-

ulator. This eliminates the need for an external regulator in

many applications powered from 9 Volt or 12 Volt batteries

or unregulated 6 Volt, 9 Volt or 12 Volt mains adapters. The

PIC16HV540 is ideally suited for applications that require

very low standby current at high voltages. These typically

require expensive low current regulators.

The PIC16HV540 is equipped with special features that

reduce system cost and power requirements. The

Power-On Reset (POR) and Device Reset Timer (DRT)

eliminate the need for external reset circuitry.There are four

oscillator conﬁgurations to choose from, including the

power-saving LP (Low Power) oscillator, cost saving RC

oscillator, and XT and HS for crystal oscillators. Power sav-

ing SLEEP mode, Watchdog Timer and code protection

features improve system cost, power and reliability.

The UV erasable CERDIP packaged versions are ideal for

code development, while the cost-effective OTP versions are

suitable for production in any volume.The customer can take

full advantage of Microchip’s price leadership in OTP micro-

controllers while beneﬁting from the OTP’s ﬂexibility.

The PIC16HV540 will in future be supported by a

full-featured macro assembler, a software simulator, an

in-circuit emulator, a ‘C’ compiler, fuzzy logic support

tools, a low-cost development programmer, and a full fea-

tured programmer. All the tools are supported on IBM®

PC and compatible machines. Functions that correspond

to the PIC16C54 (such as assembly and programming)

can utilize existing tools.

1.1

Applications

The PIC16HV540 ﬁts perfectly in low-power battery appli-

cations such as CO and smoke detection, toys, games,

security systems and automobile modules. The EPROM

technology makes customizing of application programs

(transmitter codes, receiver frequencies, etc.) extremely

fast and convenient. The small footprint package, for

through hole or surface mounting, make this microcontrol-

ler perfect for applications with space limitations.

Low-cost, low-power, high-performance, ease of use and

I/O ﬂexibility make the PIC16HV540 very versatile even in

areas where no microcontroller use has been considered

before (e.g., timer functions, replacement of “glue” logic in

larger systems, coprocessor applications).

1.2

Enhanced Features

1.2.1

REGULATED I/O PORTA INDEPENDENT

OF CORE REGULATOR

PORTA I/O pads and OSC2 output are powered by the

regulated internal voltage VIO. A maximum of 10mA per

output is allowed, or a total of 40mA. The core itself is

powered from the independently regulated supply

VREG.

1.2.2

HIGH VOLTAGE I/O PORTB

All eight PORTB I/Os are high voltage I/O. The inputs

will tolerate input voltages as high as the VDD and out-

puts will swing from VSS to the VDD. The input threshold

voltages vary with supply voltage. (See DC character-

istics.)

1.2.3

WAKE UP ON PIN CHANGE ON PORTB [0:3]

Four of the PORTB inputs latch the status of the pin at

the onset of sleep mode. A level change on the inputs

resets the device, implementing wake up on pin change

(via warm reset). The PC bit in the status register is

reset to indicate that a pin change caused the reset

condition. Any pin change (glitch insensitive) of the

opposite level of the initial value wakes up the device.

This option can be enabled/disabled in OPTION2 reg-

ister. (See OPTION2 register, Figure 4-3.)

1.2.4

WAKE UP ON PIN CHANGE WITH A

SLOWLY-RISING VOLTAGE ON PORTB [7]

PORTB [7] also implements wake up from sleep, how-

ever this input is speciﬁcally adapted so that a slowly

rising voltage does not cause excessive power con-

sumption. This input can be used with external RC cir-

cuits for long sleep periods without using the internal

timer and prescaler. This option is also enabled/dis-

abled in OPTION2 register. (The enable/disable bit is

shared with the other 4 wake up inputs.) The new wake

up status bit in the status register is also shared with

the other four wake up inputs.

1.2.5

LOW-VOLTAGE (BROWN-OUT)

DETECTION

A low voltage (Brown-out) detect circuit optionally

resets the device at a voltage level higher than that at

which Brown-out events occur. The nominal trip volt-

ages are 3.1 Volt (for 5 Volt operation) and 2.2 Volt (for

3 Volt operation), respectively. The core remains in the

reset state as long as this condition holds (as if a MCLR

external reset was given). The Brown-out trip level is

user selectable, with built-in interlocks. The Brown-out

detector is disabled at power-up and is activated by

clearing the appropriate bit (BE) in OPTION2 register.

1.2.6

INCREASED STACK DEPTH

The stack depth is 4 levels to allow modular program

implementation by using functions and subroutines.

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