DSPIC30F2010 datasheet(124/202 Pages) MICROCHIP

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dsPIC30F2010

DS70118J-page 124

19.2

Oscillator Configurations

19.2.1

INITIAL CLOCK SOURCE

SELECTION

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

Reset, the device selects its clock source based on:

FOS<1:0> Configuration bits that select one of

four oscillator groups.

AND FPR<3:0> Configuration bits that select one

of 13 oscillator choices within the primary group.

The selection is as shown in Table 19-2.

19.2.2

OSCILLATOR START-UP TIMER

(OST)

In order to ensure that a crystal oscillator (or ceramic

resonator) has started and stabilized, an oscillator

start-up timer is included. It is a simple 10-bit counter

that counts 1024 TOSC cycles before releasing the

oscillator clock to the rest of the system. The time-out

period is designated as TOST. The TOST time is involved

every time the oscillator has to restart (i.e., on POR,

BOR and wake-up from Sleep). The oscillator start-up

timer is applied to the LP Oscillator, XT, XTL, and HS

modes (upon wake-up from Sleep, POR, and BOR) for

the primary oscillator.

TABLE 19-2:

CONFIGURATION BIT VALUES FOR CLOCK SELECTION

Oscillator Mode

Oscillator

Source

FOS1

FOS0

FPR3

FPR2

FPR1

FPR0

OSC2 Function

ECIO

EC w/ PLL 4x

EC w/ PLL 8x

EC w/ PLL 16x

ERC

ERCIO

XT w/ PLL 4x

XT w/ PLL 8x

XT w/ PLL 16x

XTL

Primary

CLKO

I/O

CLKO

I/O

OSC2

Secondary

——

—

See Note 1 and 2

FRC

Internal FRC

——

—

See Note 1 and 2

LPRC

Internal LPRC

——

—

See Note 1 and 2

Note 1:

The OSC2 pin is either usable as a general-purpose I/O pin or is completely unusable, depending on the

Primary Oscillator mode selection (FPR<3:0>).

Note that the 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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