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PIC16LC557-IL

EPROM-Based 8-Bit CMOS Microcontrollers

Microchip Technology 

1.0 GENERAL DESCRIPTION

The PIC16C55X are 18, 20 and 28-Pin EPROM-based

members of the versatile PIC16CXX family of low cost,

high performance, CMOS, fully-static, 8-bit

microcontrollers.

All PIC® microcontrollers employ an advanced RISC

architecture. The PIC16C55X have enhanced core fea-

tures, eight-level deep stack, and multiple internal and

external interrupt sources. The separate instruction

and data buses of the Harvard architecture allow a 14-

bit wide instruction word with the separate 8-bit wide

data. The two-stage instruction pipeline allows all

instructions to execute in a single-cycle, except for pro-

gram branches (which require two cycles). A total of 35

instructions (reduced instruction set) are available.

Additionally, a large register set gives some of the

architectural innovations used to achieve a very high

performance.

PIC16C55X microcontrollers typically achieve a 2:1

code compression and a 4:1 speed improvement over

other 8-bit microcontrollers in their class.

The PIC16C554 has 80 bytes of RAM. The PIC16C557

and PIC16C558 have 128 bytes of RAM. The

PIC16C554 and PIC16C558 have 13 I/O pins and an 8-

bit timer/counter with an 8-bit programmable prescaler.

The PIC16C557 has 22 I/O pins and an 8-bit timer/

counter with an 8-bit programmable prescaler.

PIC16C55X devices have special features to 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 LP

oscillator minimizes power consumption, XT is a

standard crystal, and the HS is for high speed crystals.

The SLEEP (power-down) mode offers power saving.

The user can wake-up the chip from SLEEP through

several external and internal interrupts and RESET.

A highly reliable Watchdog Timer, with its own on-chip

RC oscillator, provides protection against software

lock-up.

PIC16C55X

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.

Table 1-1 shows the features of the PIC16C55X mid-

range microcontroller families.

A simplified block diagram of the PIC16C55X is shown

in Figure 3-1.

The PIC16C55X series fit perfectly in applications

ranging from motor control to low power remote sen-

sors. The EPROM technology makes customization of

application programs (detection levels, pulse genera-

tion, timers, etc.) extremely fast and convenient. The

small footprint packages make this microcontroller

series perfect for all applications with space limitations.

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

and I/O flexibility make the PIC16C55X very versatile.

1.1 Family and Upward Compatibility

Users familiar with the family of microcontrollers will

realize that this is an enhanced version of the architec-

ture. Please refer to Appendix A for a detailed list of

enhancements. Code written for can be easily ported

to PIC16C55X family of devices (Appendix B).

The PIC16C55X family fills the niche for users wanting

to migrate up from the family and not needing various

peripheral features of other members of the PIC16XX

mid-range microcontroller family.

1.2 Development Support

The PIC16C55X family is supported by a full-featured

macro assembler, a software simulator, an in-circuit

emulator, a low cost development programmer and a

full-featured programmer.

 1996-2013 Microchip Technology Inc.

Preliminary

DS40143E-page 5

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