PIC17C44 datasheet(5/241 Pages) MICROCHIP

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DS30412C-page 5

PIC17C4X

1.0

OVERVIEW

This data sheet covers the PIC17C4X group of the

PIC17CXX family of microcontrollers. The following

devices are discussed in this data sheet:

• PIC17C42

• PIC17CR42

• PIC17C42A

• PIC17C43

• PIC17CR43

• PIC17C44

The

PIC17CR42,

PIC17C42A,

PIC17C43,

PIC17CR43, and PIC17C44 devices include architec-

tural

enhancements

over

the

PIC17C42. These

enhancements will be discussed throughout this data

sheet.

The

PIC17C4X

devices

are

40/44-Pin,

EPROM/ROM-based

members

the

versatile

PIC17CXX

family

low-cost,

high-performance,

CMOS, fully-static, 8-bit microcontrollers.

All PIC16/17 microcontrollers employ an advanced

RISC architecture. The PIC17CXX has enhanced core

features, 16-level deep stack, and multiple internal and

external interrupt sources. The separate instruction and

data buses of the Harvard architecture allow a 16-bit

wide instruction word with a separate 8-bit wide data.

The two stage instruction pipeline allows all instructions

to execute in a single cycle, except for program

branches (which require two cycles). A total of 55

instructions (reduced instruction set) are available in

the PIC17C42 and 58 instructions in all the other

devices. Additionally, a large register set gives some of

the architectural innovations used to achieve a very

high performance. For mathematical intensive applica-

tions all devices, except the PIC17C42, have a single

cycle 8 x 8 Hardware Multiplier.

PIC17CXX microcontrollers typically achieve a 2:1

code compression and a 4:1 speed improvement over

other 8-bit microcontrollers in their class.

PIC17C4X devices have up to 454 bytes of RAM and

33 I/O pins. In addition, the PIC17C4X adds several

peripheral features useful in many high performance

applications including:

• Four timer/counters

• Two capture inputs

• Two PWM outputs

• A Universal Synchronous Asynchronous Receiver

Transmitter (USART)

These special features reduce external components,

thus reducing cost, enhancing system reliability and

reducing power consumption. There are four oscillator

options, of which the single pin RC oscillator provides a

low-cost solution, the LF oscillator is for low frequency

crystals and minimizes power consumption, XT is a

standard crystal, and the EC is for external clock input.

The SLEEP (power-down) mode offers additional

power saving. The user can wake-up the chip from

SLEEP through several external and internal interrupts

and device resets.

There are four conﬁguration options for the device oper-

ational modes:

• Microprocessor

• Microcontroller

• Extended microcontroller

• Protected microcontroller

The microprocessor and extended microcontroller

modes allow up to 64K-words of external program

memory.

A highly reliable Watchdog Timer with its own on-chip

RC oscillator provides protection against software mal-

function.

Table 1-1 lists the features of the PIC17C4X devices.

A UV-erasable CERDIP-packaged version is ideal for

code development while the cost-effective One-Time

Programmable (OTP) version is suitable for production

in any volume.

The PIC17C4X ﬁts perfectly in applications ranging

from precise motor control and industrial process con-

trol to automotive, instrumentation, and telecom appli-

cations. Other applications that require extremely fast

execution of complex software programs or the ﬂexibil-

ity of programming the software code as one of the last

steps of the manufacturing process would also be well

suited. The EPROM technology makes customization

of application programs (with unique security codes,

combinations, model numbers, parameter storage,

etc.) fast and convenient. Small footprint package

options make the PIC17C4X ideal for applications with

space limitations that require high performance. High

speed execution, powerful peripheral features, ﬂexible

I/O, and low power consumption all at low cost make

the PIC17C4X ideal for a wide range of embedded con-

trol applications.

1.1

Family and Upward Compatibility

Those

users

familiar

with

the

PIC16C5X

and

PIC16CXX families of microcontrollers will see the

architectural enhancements that have been imple-

mented. These enhancements allow the device to be

more efﬁcient in software and hardware requirements.

Please refer to Appendix A for a detailed list of

enhancements and modiﬁcations. Code written for

PIC16C5X or PIC16CXX can be easily ported to

PIC17CXX family of devices (Appendix B).

1.2

Development Support

The PIC17CXX family is supported by a full-featured

macro assembler, a software simulator, an in-circuit

emulator, a universal programmer, a “C” compiler, and

fuzzy logic support tools.

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