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PIC18F8620 Datasheet

  • PIC18F8620

  • 64/80-Pin High-Performance,256 Kbit to 1 Mbit Enhanced Flash...

  • 380頁(yè)

  • Microchip   Microchip

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PIC18F6520/8520/6620/8620/6720/8720
If the main oscillator is configured for HS-PLL mode, an
oscillator start-up time (T
OST
), plus an additional PLL
time-out (T
PLL
), will occur. The PLL time-out is typically
2 ms and allows the PLL to lock to the main oscillator
frequency. A timing diagram, indicating the transition
from the Timer1 oscillator to the main oscillator for
HS-PLL mode, is shown in Figure 2-10.
FIGURE 2-10:
Q4
TIMING FOR TRANSITION BETWEEN TIMER1 AND OSC1 (HS WITH PLL)
Q1
T
T
1
P
Q1 Q2 Q3 Q4
Q1 Q2 Q3 Q4
T1OSI
OSC1
T
OST
T
PLL
OSC2
PLL Clock
Input
Internal System
Clock
SCS
(OSCCON<0>)
Program Counter
PC
PC + 2
PC + 4
T
OSC
1
2
3
T
SCS
4
5
6
7
8
Note 1:
T
OST
= 1024 T
OSC
(drawing not to scale).
If the main oscillator is configured in the RC, RCIO, EC
or ECIO modes, there is no oscillator start-up time-out.
Operation will resume after eight cycles of the main
oscillator have been counted. A timing diagram,
indicating the transition from the Timer1 oscillator to the
main oscillator for RC, RCIO, EC and ECIO modes, is
shown in Figure 2-11.
FIGURE 2-11:
TIMING FOR TRANSITION BETWEEN TIMER1 AND OSC1 (RC, EC)
Q3
Q4
Q1
T
T
1
P
Q1 Q2 Q3
Q4 Q1 Q2
Q3 Q4
T1OSI
OSC1
OSC2
Internal System
Clock
SCS
(OSCCON<0>)
T
OSC
1
2
3
4
5
6
7
8
T
SCS
Program
Counter
Note 1:
RC Oscillator mode assumed.
PC
PC + 2
PC + 4
錚?/div>
2004 Microchip Technology Inc.
DS39609B-page 27

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