PIC16F1847-I/SO Microchip Technology, PIC16F1847-I/SO Datasheet - Page 57

• Manufacturer Part Number: PIC16F1847-I/SO
• Description: 14 KB Flash, 1K Bytes RAM, 32 MHz Int. Osc, 16 I/0, Enhanced Mid Range Core 18 S
• Manufacturer: Microchip Technology

Specifications of PIC16F1847-I/SO

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5.2.1.5
The Timer1 Oscillator is a separate crystal oscillator
that is associated with the Timer1 peripheral. It is opti-
mized for timekeeping operations with a 32.768 kHz
crystal connected between the T1OSO and T1OSI
device pins.
The Timer1 Oscillator can be used as an alternate sys-
tem clock source and can be selected during run-time
using clock switching. Refer to
Switching”
FIGURE 5-5:
 2011 Microchip Technology Inc.
Note 1: Quartz
C1
C2
2: Always verify oscillator performance over
3: For oscillator design assistance, reference
• AN826, “Crystal Oscillator Basics and
• AN849, “Basic PIC
• AN943, “Practical PIC
• AN949, “Making Your Oscillator Work”
• TB097, “Interfacing a Micro Crystal
• AN1288, “Design Practices for
for more information.
according
manufacturer. The user should consult the
manufacturer data sheets for specifications
and recommended application.
the V
expected for the application.
the following Microchip Applications Notes:
Crystal Selection for rfPIC
Devices” (DS00826)
(DS00849)
Analysis and Design” (DS00943)
(DS00949)
MS1V-T1K 32.768 kHz Tuning Fork
Crystal to a PIC16F690/SS” (DS91097)
Low-Power External Oscillators”
(DS01288)
TIMER1 Oscillator
32.768 kHz
Quartz
Crystal
DD
and temperature range that is
crystal
QUARTZ CRYSTAL
OPERATION (TIMER1
OSCILLATOR)
to
T1OSI
T1OSO
type,
PIC
®
characteristics
Oscillator Design”
Section 5.3 “Clock
®
®
MCU
Oscillator
®
package
and PIC
To Internal
Logic
®
vary
and
Preliminary
5.2.1.6
The external Resistor-Capacitor (RC) modes support
the use of an external RC circuit. This allows the
designer maximum flexibility in frequency choice while
keeping costs to a minimum when clock accuracy is not
required.
The RC circuit connects to OSC1. OSC2/CLKOUT is
available for general purpose I/O or CLKOUT. The
function of the OSC2/CLKOUT pin is determined by the
state of the CLKOUTEN bit in Configuration Word 1.
Figure 5-5
FIGURE 5-6:
The RC oscillator frequency is a function of the supply
voltage, the resistor (R
and the operating temperature. Other factors affecting
the oscillator frequency are:
• threshold voltage variation
• component tolerances
• packaging variations in capacitance
The user also needs to take into account variation due
to tolerance of external RC components used.
F
R
C
OSC
Note 1:
V
Recommended values: 10 k  R
EXT
EXT
SS
/4 or
V
DD
I/O
shows the external RC mode connections.
(1)
Output depends upon CLKOUTEN bit of the
Configuration Word 1.
External RC Mode
PIC16(L)F1847
OSC1/CLKIN
OSC2/CLKOUT
EXT
EXTERNAL RC MODES
3 k  R
C
EXT
) and capacitor (C
PIC
> 20 pF, 2-5V
EXT
®
EXT
MCU
 100 k, 3-5V
DS41453A-page 57
 100 k, <3V
EXT
Internal
Clock
) values