DSPIC33EP64GS708 datasheet(108/484 Pages) MICROCHIP

108 / 484 page

dsPIC33EPXXXGS70X/80X FAMILY

DS70005258C-page 108

 2016-2018 Microchip Technology Inc.

TABLE 9-1:

CONFIGURATION BIT VALUES FOR CLOCK SELECTION

9.2

Auxiliary Clock Generation

The auxiliary clock generation is used for peripherals

that need to operate at a frequency unrelated to the

system clock, such as PWM or ADC.

The primary oscillator and internal FRC oscillator

sources can be used with an Auxiliary PLL (APLL) to

obtain the auxiliary clock. The Auxiliary PLL has a fixed

16x multiplication factor.

The auxiliary clock has the following configuration

restrictions:

• For proper PWM operation, auxiliary clock

generation must be configured for 120 MHz (see

Parameter OS56 in Section 30.0 “Electrical Char-

acteristics”). If a slower frequency is desired, the

PWM Input Clock Prescaler (Divider) Select bits

(PCLKDIV<2:0>) should be used.

• To achieve 1.04 ns PWM resolution, the auxiliary

clock must use the 16x Auxiliary PLL (APLL). All

other clock sources will have a minimum PWM

resolution of 8 ns.

• If the primary PLL is used as a source for the

auxiliary clock, the primary PLL should be config-

ured up to a maximum operation of 30 MIPS or

less.

9.3

Reference Clock Generation

The reference clock output logic provides the user with

the ability to output a clock signal based on the system

clock or the crystal oscillator on a device pin. The user

application can specify a wide range of clock scaling

prior to outputting the reference clock.

9.4

Oscillator Resources

Many useful resources are provided on the main prod-

uct page of the Microchip website for the devices listed

in this data sheet. This product page contains the latest

updates and additional information.

9.4.1

KEY RESOURCES

• “Oscillator Module” (DS70005131) in the

“dsPIC33/PIC24 Family Reference Manual”

• Code Samples

• Application Notes

• Software Libraries

• Webinars

• All Related “dsPIC33/PIC24 Family Reference

Manual” Sections

• Development Tools

Oscillator Mode

Oscillator Source

POSCMD<1:0> FNOSC<2:0>

See

Notes

Fast RC Oscillator with Divide-by-n (FRCDIVN)

Internal

111

1, 2

Fast RC Oscillator with Divide-by-16

Internal

110

Low-Power RC Oscillator (LPRC)

Internal

101

Primary Oscillator (HS) with PLL (HSPLL)

Primary

011

Primary Oscillator (XT) with PLL (XTPLL)

Primary

011

Primary Oscillator (EC) with PLL (ECPLL)

Primary

011

Primary Oscillator (HS)

Primary

010

Primary Oscillator (XT)

Primary

010

Primary Oscillator (EC)

Primary

010

Fast RC Oscillator (FRC) with Divide-by-N and

PLL (FRCPLL)

Internal

001

Fast RC Oscillator (FRC)

Internal

000

Note 1:

OSC2 pin function is determined by the OSCIOFNC Configuration bit.

This is the default Oscillator mode for an unprogrammed (erased) device.

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