DSPIC30F datasheet(158/248 Pages) MICROCHIP

158 / 248 page

dsPIC30F

DS70083G-page 156

Preliminary

 2004 Microchip Technology Inc.

20.2

Oscillator Configurations

20.2.1

INITIAL CLOCK SOURCE

SELECTION

While coming out of Power-on Reset or Brown-out

Reset, the device selects its clock source based on:

FOS<2:0> configuration bits that select one of

four oscillator groups,

and FPR<4:0> configuration bits that select one

of 13 oscillator choices within the primary group.

The selection is as shown in Table 20-2.

TABLE 20-2:

CONFIGURATION BIT VALUES FOR CLOCK SELECTION

Note:

Some devices may have different FOS

and FPR values from Table 20-2, depend-

ing on the oscillator modes supported.

Refer to individual device data sheets for

details.

Oscillator Mode

Oscillator

Source

FOS<2:0>

FPR<4:0>

OSC2

Function

ECIO w/ PLL 4x

PLL

I/O

ECIO w/ PLL 8x

PLL

I/O

ECIO w/ PLL 16x

PLL

I/O

FRC w/ PLL 4x

PLL

I/O

FRC w/ PLL 8x

PLL

I/O

FRC w/ PLL 16x

PLL

I/O

XT w/ PLL 4x

PLL

OSC2

XT w/ PLL 8x

PLL

OSC2

XT w/ PLL 16x

PLL

OSC2

HS2 w/ PLL 4x

PLL

OSC2

HS2 w/ PLL 8x

PLL

OSC2

HS2 w/ PLL 16x

PLL

OSC2

HS3 w/ PLL 4x

PLL

OSC2

HS3 w/ PLL 8x

PLL

OSC2

HS3 w/ PLL 16x

PLL

OSC2

ECIO

External

I/O

External

OSC2

External

OSC2

External

CLKOUT

ERC

External

CLKOUT

ERCIO

External

I/O

XTL

External

OSC2

Secondary

(Notes 1, 2)

FRC

Internal FRC

(Notes 1, 2)

LPRC

Internal LPRC

(Notes 1, 2)

Note 1:

OSC2 pin function is determined by (FPR<4:0>).

Note that OSC1 pin cannot be used as an I/O pin even if the secondary oscillator or an internal clock

source is selected at all times.

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