PIC16C9XX
1.0
GENERAL DESCRIPTION
The PIC16C9XX is a family of low-cost, high-perfor-
mance, CMOS, fully-static, 8-bit microcontrollers with
an integrated LCD Driver module, in the PIC16CXXX
mid-range family.
All PICmicro™ microcontrollers employ an advanced
RISC architecture. The PIC16CXXX microcontroller
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 regis-
ter set gives some of the architectural innovations used
to achieve a very high performance.
PIC16CXXX microcontrollers typically achieve a 2:1
code compression and a 4:1 speed improvement over
other 8-bit microcontrollers in their class.
The
PIC16C923
devices have 176 bytes of RAM and
25 I/O pins. In addition several peripheral features are
available including: three timer/counters, one Cap-
ture/Compare/PWM module, one serial port and one
LCD module. The Synchronous Serial Port can be con-
figured as either a 3-wire Serial Peripheral Interface
(SPI) or the two-wire Inter-Integrated Circuit (I
2
C) bus.
The LCD module features programmable multiplex
mode (static, 1/2, 1/3 and 1/4) and drive bias (static and
1/3). It is capable of driving up to 32 segments and up
to 4 commons. It can also drive the LCD panel while in
SLEEP mode.
The
PIC16C924
devices have 176 bytes of RAM and
25 I/O pins. In addition several peripheral features are
available including: three timer/counters, one Cap-
ture/Compare/PWM module, one serial port and one
LCD module. The Synchronous Serial Port can be con-
figured as either a 3-wire Serial Peripheral Interface
(SPI) or the two-wire Inter-Integrated Circuit (I
2
C) bus.
The LCD module features programmable multiplex
mode (static, 1/2, 1/3 and 1/4) and drive bias (static and
1/3). It is capable of driving up to 32 segments and up
to 4 commons. It can also drive the LCD panel while in
SLEEP mode. The PIC16C924 also has an 5-channel
high-speed 8-bit A/D. The 8-bit resolution is ideally
suited for applications requiring low-cost analog inter-
face, e.g. thermostat control, pressure sensing, and
meters.
The PIC16C9XX family has 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 oscil-
lator minimizes power consumption, XT is a standard
crystal, and the HS is for High Speed crystals. 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
reset(s).
A highly reliable Watchdog Timer with its own on-chip
RC oscillator provides recovery in the event of a soft-
ware lock-up.
A UV erasable CERQUAD (compatible with PLCC)
packaged version is ideal for code development while
the cost-effective One-Time-Programmable (OTP) ver-
sion is suitable for production in any volume.
The PIC16C9XX family fits perfectly in applications
ranging from handheld meters, thermostats, to home
security products. The EPROM technology makes cus-
tomization of application programs (LCD panels, cali-
bration constants, sensor interfaces, 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 perfor-
mance, ease of use and I/O flexibility make the
PIC16C9XX very versatile even in areas where no
microcontroller use has been considered before (e.g.
timer functions, capture and compare, PWM functions
and coprocessor applications).
1.1
Family and Upward Compatibility
Users familiar with the PIC16C5X microcontroller family
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 the
PIC16C5X can be easily ported to the PIC16CXXX
family of devices (Appendix B).
1.2
Development Support
PIC16C9XX devices are supported by the complete
line of Microchip Development tools.
Please refer to Section 16.0 for more details about
Microchip’s development tools.
©
1997 Microchip Technology Inc.
DS30444E- page 5
MICROCHIP [ MICROCHIP TECHNOLOGY ]
