PIC18F23K22-ESLASHML datasheet(43/496 Pages) MICROCHIP

43 / 496 page

 2010 Microchip Technology Inc.

Preliminary

DS41412C-page 43

PIC18(L)F2X/4XK22

2.10.2

TWO-SPEED START-UP

SEQUENCE

Wake-up from Power-on Reset or Sleep.

Instructions begin executing by the internal

oscillator at the frequency set in the IRCF<2:0>

bits of the OSCCON register.

OST enabled to count 1024 external clock

cycles.

OST timed out. External clock is ready.

OSTS is set.

Clock switch finishes according to Figure 2-9

2.10.3

CHECKING TWO-SPEED CLOCK

STATUS

Checking the state of the OSTS bit of the OSCCON

from the external clock source, as defined by the

FOSC<2:0> bits in CONFIG1H Configuration register,

or the internal oscillator. OSTS = 0 when the external

oscillator is not ready, which indicates that the system

is running from the internal oscillator.

FIGURE 2-9:

CLOCK SWITCH TIMING

Old Clock

New Clock

IRCF <2:0>

System Clock

Start-up Time(1)

Clock Sync

Running

High Speed

Low Speed

Select Old

Select New

New Clk Ready

Low Speed

High Speed

Old Clock

New Clock

IRCF <2:0>

System Clock

Start-up Time(1)

Clock Sync

Running

Select Old

Select New

New Clk Ready

Note 1: Start-up time includes TOST (1024 TOSC) for external clocks, plus TPLL (approx. 2 ms) for HSPLL mode.

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