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2000 Microchip Technology Inc.

Preliminary

DS41124C-page 5

PIC16C745/765

1.0

GENERAL DESCRIPTION

The PIC16C745/765 devices are low cost, high-perfor-

mance, CMOS, fully-static, 8-bit microcontrollers in the

PIC16CXX mid-range family.

All PICmicro microcontrollers employ an advanced

RISC architecture. The PIC16C745/765 microcontrol-

ler family has enhanced core features, 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 program branches, which

require two cycles. A total of 35 instructions (reduced

instruction set) are available. Additionally, a large reg-

ister set gives some of the architectural innovations

used to achieve a very high performance.

The PIC16C745

device has 22 I/O

pins. The

PIC16C765 device has 33 I/O pins. Each device has

256 bytes of RAM. In addition, several peripheral fea-

tures are available including: three timer/counters, two

Capture/Compare/PWM modules and two serial ports.

The Universal Serial Bus (USB 1.1) low speed periph-

eral provides bus communications. The Universal

Synchronous

Asynchronous

Receiver

Transmitter

(USART) is also known as the Serial Communications

Interface or SCI. Also, a 5-channel high-speed 8-bit

A/D is provided on the PIC16C745, while the

PIC16C765 offers 8 channels. The 8-bit resolution is

ideally suited for applications requiring a low cost ana-

log interface (e.g., thermostat control, pressure sens-

ing, etc.).

The PIC16C745/765 devices have special features to

reduce external components, thus reducing cost,

enhancing system reliability and reducing power con-

sumption. There are 4 oscillator options, of which EC is

for the external regulated clock source, E4 is for the

external regulated clock source with the PLL enabled,

HS is for the high speed crystals/resonators and H4 is

for high speed crystals/resonators with the PLL

enabled. The SLEEP (power-down) feature provides a

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

from SLEEP through several external and internal

interrupts and RESETS.

A highly reliable Watchdog Timer (WDT), with a dedi-

cated on-chip RC oscillator, provides protection against

software lock-up, and also provides one way of waking

the device from SLEEP.

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 PIC16C745/765 devices fit nicely in many applica-

tions ranging from security and remote sensors to appli-

ance

controls

and

automotives.

The

EPROM

technology makes customization of application pro-

grams

(data

loggers,

industrial

controls,

UPS)

extremely fast and convenient. The small footprint pack-

ages 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 PIC16C745/765 devices very versatile, even

in areas where no microcontroller use has been consid-

ered before (e.g., timer functions, serial communication,

capture and compare, PWM functions and coprocessor

applications).

1.1

Family and Upward Compatibility

Users familiar with the PIC16C5X microcontroller fam-

ily will realize that this is an enhanced version of the

PIC16C5X

architecture.

Code

written

for

the

PIC16C5X can be easily ported to the PIC16C745/765

family of devices.

1.2

Development Support

PICmicro devices are supported by the complete line

of Microchip Development tools.

Please refer to Section 15.0 for more details about

Microchip’s development tools.

745cov.book Page 5 Wednesday, August 2, 2000 8:24 AM

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