Peripheral Features:
• 8-bit real time clock/counter (TMR0) with 8-bit
programmable prescaler
• Power-On Reset (POR)
• Device Reset Timer (DRT)
• Watchdog Timer (WDT) with its own on-chip RC
oscillator for reliable operation
• Programmable code-protection
• 1,000,000 erase/write cycle EEPROM data
memory
• EEPROM data retention > 40 years
• Power saving SLEEP mode
• Wake-up from SLEEP on pin change
• Internal weak pull-ups on I/O pins
• Internal pull-up on MCLR pin
• Selectable oscillator options:
- INTRC: Internal 4 MHz RC oscillator
- EXTRC: External low-cost RC oscillator
- XT: Standard crystal/resonator
- LP: Power saving, low frequency crystal

1.0 GENERAL DESCRIPTION
The PIC12C5XX from Microchip Technology is a family
of low-cost, high performance, 8-bit, fully static,
EEPROM/EPROM/ROM-based CMOS microcontrollers.
It employs a RISC architecture with only 33 single
word/single cycle instructions. All instructions are
single cycle (1 ms) except for program branches
which take two cycles. The PIC12C5XX delivers performance
an order of magnitude higher than its competitors
in the same price category. The 12-bit wide
instructions are highly symmetrical resulting in 2:1
code compression over other 8-bit microcontrollers in
its class. The easy to use and easy to remember
instruction set reduces development time significantly.
The PIC12C5XX products are equipped with special
features that reduce system cost and power requirements.
The Power-On Reset (POR) and Device Reset
Timer (DRT) eliminate the need for external reset circuitry.
There are four oscillator configurations to choose
from, including INTRC internal oscillator mode and the
power-saving LP (Low Power) oscillator mode. Power
saving SLEEP mode, Watchdog Timer and code
protection features also improve system cost, power
and reliability.
The PIC12C5XX are available in the cost-effective
One-Time-Programmable (OTP) versions which are
suitable for production in any volume. The customer
can take full advantage of Microchip’s price leadership
in OTP microcontrollers while benefiting from the OTP’s
flexibility.
The PIC12C5XX products are supported by a full-featured
macro assembler, a software simulator, an in-circuit
emulator, a ‘C’ compiler, fuzzy logic support tools,
a low-cost development programmer, and a full featured
programmer. All the tools are supported on IBMÒ
PC and compatible machines.

1.1 Applications
The PIC12C5XX series fits perfectly in applications
ranging from personal care appliances and security
systems to low-power remote transmitters/receivers.
The EPROM technology makes customizing application
programs (transmitter codes, appliance settings,
receiver frequencies, etc.) extremely fast and convenient,
while the EEPROM data memory technology
allows for the changing of calibration factors and security
codes. The small footprint packages, for through
hole or surface mounting, make this microcontroller
series perfect for applications with space limitations.
Low-cost, low-power, high performance, ease of use
and I/O flexibility make the PIC12C5XX series very versatile
even in areas where no microcontroller use has
been considered before (e.g., timer functions, replacement
of “glue” logic and PLD’s in larger systems, coprocessor
applications).