PIC12F1822 MICROCHIP [Microchip Technology], PIC12F1822 Datasheet - Page 65

• Manufacturer Part Number: PIC12F1822
• Description: 8/14-Pin Flash Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

5.4.2
1.
2.
3.
4.
5.
6.
7.
FIGURE 5-8:
 2010 Microchip Technology Inc.
Program Counter
Wake-up from Power-on Reset or Sleep.
Instructions begin execution by the internal
oscillator at the frequency set in the IRCF<3:0>
bits of the OSCCON register.
OST enabled to count 1024 clock cycles.
OST timed out, wait for falling edge of the
internal oscillator.
OSTS is set.
System clock held low until the next falling edge
of new clock (LP, XT or HS mode).
System clock is switched to external clock
source.
System Clock
INTOSC
TWO-SPEED START-UP
SEQUENCE
OSC1
OSC2
TWO-SPEED START-UP
0
PC - N
1
T
T
OST
1022 1023
PC
PIC12F/LF1822/16F/LF1823
Preliminary
5.4.3
Checking the state of the OSTS bit of the OSCSTAT
register will confirm if the microcontroller is running
from the external clock source, as defined by the
FOSC<2:0> bits in the Configuration Word 1, or the
internal oscillator.
CHECKING TWO-SPEED CLOCK
STATUS
PC + 1
DS41413A-page 65