PIC16F1513-I/SP 查看數據表（PDF） - Microchip Technology

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PIC16F1513-I/SP

28-Pin Flash Microcontrollers with XLP Technology

Microchip Technology 

5.2.1.4 Secondary Oscillator

The secondary oscillator is a separate crystal oscillator

that is associated with the Timer1 peripheral. It is

optimized for timekeeping operations with a 32.768

kHz crystal connected between the SOSCO and

SOSCI device pins.

The secondary oscillator can be used as an alternate

system 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:

QUARTZ CRYSTAL

OPERATION

(SECONDARY

OSCILLATOR)

PIC® MCU

SOSCI

C1

32.768 kHz

Quartz

Crystal

To Internal

Logic

C2

SOSCO

Note 1: Quartz crystal characteristics vary

according to type, package and

manufacturer. The user should consult the

manufacturer data sheets for specifications

and recommended application.

2: Always verify oscillator performance over

the VDD and temperature range that is

expected for the application.

3: For oscillator design assistance, reference

the following Microchip Applications Notes:

• AN826, “Crystal Oscillator Basics and

Crystal Selection for rfPIC® and PIC®

Devices” (DS00826)

• AN849, “Basic PIC® Oscillator Design”

(DS00849)

• AN943, “Practical PIC® Oscillator

Analysis and Design” (DS00943)

• AN949, “Making Your Oscillator Work”

(DS00949)

• TB097, “Interfacing a Micro Crystal

MS1V-T1K 32.768 kHz Tuning Fork

Crystal to a PIC16F690/SS” (DS91097)

• AN1288, “Design Practices for

Low-Power External Oscillators”

(DS01288)

PIC16(L)F1512/3

5.2.1.5 External RC Mode

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

CLKOUTEN bit in Configuration Words.

Figure 5-6 shows the external RC mode connections.

FIGURE 5-6:

EXTERNAL RC MODES

VDD

REXT

CEXT

VSS

FOSC/4 or I/O(1)

PIC® MCU

OSC1/CLKIN

OSC2/CLKOUT

Internal

Clock

Recommended values: 10 k  REXT  100 k, <3V

3 k  REXT  100 k, 3-5V

CEXT > 20 pF, 2-5V

Note 1: Output depends upon the CLKOUTEN bit of

the Configuration Words.

The RC oscillator frequency is a function of the supply

voltage, the resistor (REXT) and capacitor (CEXT) values

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 the external RC components used.

 2012-2014 Microchip Technology Inc.

DS40001624C-page 45

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