PIC16C745/765
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.
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.
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.
All PICmicro® microcontrollers employ an advanced
RISC architecture. The PIC16CXX microcontroller fam-
ily 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 register set gives
some of the architectural innovations used to achieve a
very high performance.
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 packages make
this microcontroller series perfect for all applications
with space limitations. Low cost, low power, high perfor-
mance, ease of use and I/O flexibility make the
PIC16C745/765 devices very versatile, even in areas
where no microcontroller use has been considered
before (e.g., timer functions, serial communication, cap-
ture and compare, PWM functions and coprocessor
applications).
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) peripheral pro-
vides bus communications. The Universal Synchro-
nous 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 pro-
vided on the PIC16C745, while the PIC16C765 offers
8 channels. The 8-bit resolution is ideally suited for
applications requiring a low-cost analog interface,
(e.g., thermostat control, pressure sensing, etc).
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 PIC16CXX fam-
ily of devices.
1.2
Development Support
PICmicro® devices are supported by the complete line
of Microchip Development tools.
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 PLL, HS is for the
high speed crystals/resonators and H4 is for high
speed crystals/resontators with PLL. 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.
Please refer to Section 15.0 for more details about
Microchip’s development tools.
1999 Microchip Technology Inc.
Advanced Information
DS41124A-page 5
MICROCHIP [ MICROCHIP ]
