PIC14000 datasheet(3/153 Pages) MICROCHIP

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Preliminary

DS40122B-page 3

PIC14000

1.0

GENERAL DESCRIPTION

The PIC14000 features include medium to high reso-

lution A/D conversion (10 to 16 bits), temperature sens-

ing, closed loop charge control, serial communication,

and low power operation.

The PIC14000 uses a RISC Harvard architecture CPU

with separate 14-bit instruction and 8-bit data buses. A

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 are

available. Additionally, a large register set is included.

PIC16/17 microcontrollers typically achieve a 2:1 code

compression and a 4:1 speed improvement over other

8-bit microcontrollers.

Features:

The PIC14000 is a 28-pin device with these features:

• 4K of EPROM

• 192 bytes of RAM

•

22 I/O pins

The analog peripherals include:

• 8 external analog input channels, two with level

shift inputs

• 6 internal analog input channels

• 2 comparators with programmable references

• A bandgap reference

• An internal temperature sensor

• A programmable current source

In addition, the I2C serial port through a multiplexer

supports two separate I2C channels.

A special oscillator option allows either an internal

4 MHz oscillator or an external crystal oscillator. Using

the internal 4 MHz oscillator requires no external com-

ponents.

The PIC14000 contains three timers, the Watchdog

Timer

(WDT),

Timer0

(TMR0),

and A/D

Timer

(ADTMR). The Watchdog Timer includes its own

on-chip RC oscillator providing protection against

software lock-up. TMR0 is a general purpose 8-bit

timer/counter with an 8-bit prescaler. It may be clocked

externally using the RC3/T0CKI pin. The ADTMR is

intended for use with the slope A/D converter, but can

also be used as a general purpose timer. It has an

associated capture register which can be used to mea-

sure the time between events.

An internal low-voltage detect circuit allows for tracking

of voltage levels. Upon detecting the low voltage con-

dition, the PIC14000 can be instructed to save its oper-

ating state then enter an idle state.

The internal band-gap reference is used for calibrating

the measurements of the analog peripherals. The

calibration factors are stored in EPROM and can be

used to achieve high measurement accuracy.

Power savings modes are available for portable appli-

cations. The SLEEP and HIBERNATE modes offer dif-

ferent levels of power savings. The PIC14000 can

wake up from these modes through interrupts or reset.

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 PIC14000 ﬁts perfectly in applications for battery

charging, capacity monitoring, and data logging. The

EPROM

technology

makes

customization

application programs (battery characteristics, feature

sets, etc.) extremely fast and convenient. The small

footprint packages make this microcontroller based

mixed signal device perfect for all applications with

space limitations. Low-cost, low-power, high perfor-

mance, ease of use and I/O ﬂexibility make the

PIC14000 very versatile in other applications such as

temperature monitors/controllers.

1.1

Family and Upward Compatibility

Code written for PIC16C6X/7X can be easily ported to

the PIC14000 (see Appendix A).

1.2

Development Support

The PIC14000 is supported by a full-featured macro

assembler, a software simulator, an in-circuit emulator,

low-cost

development

programmer

and

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

logic support tools are also available.

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