DSPIC33FJMC202ESS datasheet(103/330 Pages) MICROCHIP

103 / 330 page

DS70283K-page 103

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304

For a primary oscillator or FRC oscillator, output ‘FIN’,

the PLL output ‘FOSC’ is given by:

EQUATION 8-2:

FOSC CALCULATION

For example, suppose a 10 MHz crystal is being used

with the selected oscillator mode of XT with PLL.

• If PLLPRE<4:0> = 0, then N1 = 2. This yields a

VCO input of 10/2 = 5 MHz, which is within the

acceptable range of 0.8-8 MHz.

• If PLLDIV<8:0> = 0x1E, then

M = 32. This yields a VCO output of 5 x 32 = 160

MHz, which is within the 100-200 MHz ranged

needed.

• If PLLPOST<1:0> = 0, then N2 = 2. This provides

a Fosc of 160/2 = 80 MHz. The resultant device

operating speed is 80/2 = 40 MIPS.

EQUATION 8-3:

XT WITH PLL MODE

EXAMPLE

FIGURE 8-2:

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304 PLL BLOCK DIAGRAM

TABLE 8-1:

CONFIGURATION BIT VALUES FOR CLOCK SELECTION

FOSC

FIN

⋅

----------------------

⎝⎠

⎛⎞

⋅

FCY

FOSC

-------------

---

10000000

⋅

-------------------------------------

⎝⎠

⎛⎞

40 MIPS

⋅

Oscillator Mode

Oscillator Source

POSCMD<1:0>

FNOSC<2:0>

See Note

Fast RC Oscillator with Divide-by-N

(FRCDIVN)

Internal

111

1, 2

Fast RC Oscillator with Divide-by-16

(FRCDIV16)

Internal

110

Low-Power RC Oscillator (LPRC)

Internal

101

Secondary (Timer1) Oscillator (Sosc)

Secondary

100

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 with PLL (FRCPLL)

Internal

001

Fast RC Oscillator (FRC)

Internal

000

Note 1: OSC2 pin function is determined by the OSCIOFNC Configuration bit.

2: This is the default oscillator mode for an unprogrammed (erased) device.

0.8-8.0 MHz

Here(1)

100-200 MHz

Here(1)

Divide by

2, 4, 8

Divide by

2-513

Divide by

2-33

Source (Crystal, External Clock

PLLPRE

VCO

PLLDIV

PLLPOST

or Internal RC)

12.5-80 MHz

Here(1)

FOSC

Note 1: This frequency range must be satisfied at all times.

FVCO

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