70592C datasheet(129/314 Pages) MICROCHIP

129 / 314 page

DS70592C-page 129

PIC24HJXXXGPX06A/X08A/X10A

For example, suppose a 10 MHz crystal is being used,

with “XT with PLL” being the selected oscillator mode.

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 9-3:

XT WITH PLL MODE

EXAMPLE

FIGURE 9-2:

PIC24HJXXXGPX06A/X08A/X10A PLL BLOCK DIAGRAM

TABLE 9-1:

CONFIGURATION BIT VALUES FOR CLOCK SELECTION

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

70592C Fiches technique(PDF) 129 Page - Microchip Technology

70592C Fiches technique(HTML) 129 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Fiches technique Télécharger

Lien URL