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PIC16C55XA

EPROM-Based 8-Bit CMOS Microcontroller

Microchip Technology 

1.0 GENERAL DESCRIPTION

The PIC16C55X(A) are 18 and 20-Pin EPROM-based

members of the versatile PIC16CXX family of low-cost,

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

microcontrollers.

All PICmicro™ microcontrollers employ an advanced

RISC architecture. The PIC16C55X(A) have enhanced

core features, eight-level deep stack, and multiple inter-

nal 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 program 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(A) microcontrollers typically achieve a 2:1

code compression and a 4:1 speed improvement over

other 8-bit microcontrollers in their class.

The PIC16C554(A) and PIC16C556A have 80 bytes of

RAM. The PIC16C558(A) has 128 bytes of RAM. Each

device has 13 I/O pins and an 8-bit timer/counter with

an 8-bit programmable prescaler.

PIC16C55X(A) 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.

PIC16C55X(A)

A highly reliable Watchdog Timer with its own on-chip

RC oscillator provides protection against software

lock- up.

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(A)

mid-range microcontroller families.

A simplified block diagram of the PIC16C55X(A) is

shown in Figure 3-1.

The PIC16C55X(A) 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(A) very versa-

tile.

1.1 Family and Upward Compatibility

Those users familiar with the PIC16C5X family of

microcontrollers will realize that this is an enhanced

version of the PIC16C5X architecture. Please refer to

Appendix A for a detailed list of enhancements. Code

written for PIC16C5X can be easily ported to

PIC16C55X(A) family of devices (Appendix B).

The PIC16C55X(A) family fills the niche for users want-

ing to migrate up from the PIC16C5X family and not

needing various peripheral features of other members

of the PIC16XX mid-range microcontroller family.

1.2 Development Support

The PIC16C55X(A) family is supported by a full-fea-

tured macro assembler, a software simulator, an in-cir-

cuit emulator, a low-cost development programmer and

a full-featured programmer. A “C” compiler and fuzzy

logic support tools are also available.

© 1997 Microchip Technology Inc.

Preliminary

DS40143B-page 5

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