PIC16F636-I/SL Microchip Technology, PIC16F636-I/SL Datasheet - Page 31

• Manufacturer Part Number: PIC16F636-I/SL
• Description: IC PIC MCU FLASH 2KX14 14-SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F636-I/SL

• Program Memory Type: FLASH
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, LVD, POR, WDT
• Number Of I /o: 11
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: RS- 232, SPI, USB
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Data Rom Size: 256 B
• Height: 1.25 mm
• Length: 8.65 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Width: 3.9 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC162057 - MPLAB ICD 2 HEADER 14DIP
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.0
3.1
The PIC12F635/PIC16F636/639 has a wide variety of
clock sources and selection features to allow it to be
used in a wide range of applications, while maximizing
performance and minimizing power consumption.
Figure 3-1
PIC12F635/PIC16F636/639 clock sources.
Clock sources can be configured from external oscillators,
quartz crystal resonators, ceramic resonators and
Resistor-Capacitor (RC) circuits. In addition, the system
clock source can be configured from one of two internal
oscillators, with a choice of speeds selectable via
software. Additional clock features include:
• Selectable system clock source between external
• Two-Speed Clock Start-up mode, which
• Fail-Safe Clock Monitor (FSCM) designed to
FIGURE 3-1:
© 2005 Microchip Technology Inc.
or internal via software.
minimizes latency between external oscillator
start-up and code execution.
detect a failure of the external clock source (LP,
XT, HS, EC or RC modes) and switch to the
internal oscillator.
OSC2
OSC1
Note 1:
CLOCK SOURCES
Overview
illustrates
2:
External Oscillator
Internal Oscillator
HFINTOSC = High-Frequency Calibrated Internal Oscillator.
LFINTOSC = Low-Frequency Internal Oscillator is not calibrated.
HFINTOSC
LFINTOSC
31 kHz
8 MHz
PIC12F635/PIC16F636/639 CLOCK SOURCE BLOCK DIAGRAM
a
(2)
(1)
block
Sleep
diagram
of
500 kHz
250 kHz
125 kHz
31 kHz
8 MHz
4 MHz
2 MHz
1 MHz
PIC12F635/PIC16F636/639
Preliminary
the
(OSCCON<6:4>)
IRCF<2:0>
111
110
101
100
011
010
001
000
The PIC12F635/PIC16F636/639 can be configured in
one of eight clock modes.
1.
2.
3.
4.
5.
6.
7.
8.
Clock source modes are configured by the FOSC<2:0>
bits
Section 12.0 “Special Features of the CPU”). The
internal clock can be generated by two oscillators. The
HFINTOSC is a high-frequency calibrated oscillator. The
LFINTOSC is a low-frequency uncalibrated oscillator.
LP, XT, HS, RC, RCIO, EC
EC – External clock with I/O on RA4.
LP – Low gain crystal or Ceramic Resonator
Oscillator mode.
XT – Medium gain crystal or Ceramic Resonator
Oscillator mode.
HS – High gain crystal or Ceramic Resonator
mode.
RC – External Resistor-Capacitor (RC) with
F
RCIO – External Resistor-Capacitor (RC) with I/O
on RA4.
INTOSC – Internal oscillator with F
on RA4 and I/O on RA5.
INTOSCIO – Internal oscillator with I/O on RA4
and RA5.
OSC
in
/4 output on RA4.
the
Power-up Timer (PWRT)
Watchdog Timer (WDT)
Fail-Safe Clock Monitor (FSCM)
Configuration
(Configuration Word)
(OSCCON<0>)
FOSC<2:0>
SCS
(CPU and Peripherals)
Word
DS41232B-page 29
System Clock
OSC
register
/4 output
(see