PIC16F753 datasheet(39/238 Pages) MICROCHIP

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 2013 Microchip Technology Inc.

Preliminary

DS40001709A-page 39

PIC16F753/HV753

4.3

System Clock Output

The CLKOUT pin is available for general purpose I/O or

system clock output. The CLKOUTEN bit of the

Configuration Word controls the function of the

CLKOUT pin.

When the CLKOUTEN bit is cleared, the CLKOUT pin

is driven by the selected internal oscillator frequency

divided by 4. The corresponding I/O pin always reads

‘0’ in this configuration.

The CLKOUT signal may be used to provide a clock for

external circuitry, synchronization, calibration, test or

other application requirements.

When the CLKOUTEN bit is set, the system clock out

function is disabled and the CLKOUT pin is available for

general purpose I/O.

4.4

Oscillator Delay upon Wake-Up,

Power-Up, and Base Frequency

Change

In applications where the OSCTUNE register is used to

shift the HFINTOSC frequency, the application should

not expect the frequency to stabilize immediately. In

this case, the frequency may shift gradually toward the

new value. The time for this frequency shift is less than

eight cycles of the base frequency.

A short delay is invoked upon power-up and when

waking from sleep to allow the memory bias circuitry to

stabilize. Table 4-1 shows examples where the oscillator

delay is invoked.

TABLE 4-1:

OSCILLATOR DELAY EXAMPLES

Switch From

Switch To

Frequency

Oscillator Delay

Sleep/POR

INTOSC

31 kHz to 8 MHz

s internal delay to allow memory

bias to stabilize.

Sleep/POR

DC – 20 MHz

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