PIC16LF1939-E/PT Microchip Technology, PIC16LF1939-E/PT Datasheet - Page 72

• Manufacturer Part Number: PIC16LF1939-E/PT
• Description: 28KB Flash, 1KB RAM, 256B EEPROM, LCD, NanoWatt XLP 44 TQFP 10x10x1mm TRAY
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16LF1939-E/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 32MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 28KB (16K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC16F193X/LF193X
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 Section 5.3 “Clock
Switching” for more information.
FIGURE 5-5:
DS41364D-page 72
Note 1: Quartz crystal characteristics vary according
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
to type, package and 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
QUARTZ CRYSTAL
OPERATION (TIMER1
OSCILLATOR)
T1OSI
T1OSO
PIC
®
Oscillator Design”
®
®
MCU
Oscillator
®
and PIC
To Internal
Logic
®
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 5-6 shows the external RC mode connections.
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
(1)
Output depends upon CLKOUTEN bit of the
Configuration Word 1.
External RC Mode
OSC1/CLKIN
OSC2/CLKOUT
EXT
EXTERNAL RC MODES
 2009 Microchip Technology Inc.
3 k  R
C
EXT
) and capacitor (C
PIC
> 20 pF, 2-5V
EXT
®
EXT
MCU
 100 k, 3-5V
 100 k, <3V
EXT
Internal
Clock
) values