Datasheet

PIC18F6585/8585/6680/8680
DS30491D-page 30  2003-2013 Microchip Technology Inc.
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, indi-
cating the transition from the Timer1 oscillator to the
main oscillator for RC, RCIO, EC and ECIO modes, is
shown in Figure 2-12.
FIGURE 2-12: TIMING FOR TRANSITION BETWEEN TIMER1 AND OSC1 (RC, EC)
Q3 Q4
Q1
Q1 Q2 Q3 Q4 Q1 Q2 Q3
OSC1
Internal System
SCS
(OSCCON<0>)
Program
PC
PC + 2
Note: RC Oscillator mode assumed.
PC + 4
T1OSI
Clock
Q4
TT1P
T OSC
TSCS
1
23
45
6
78
Counter
18F8680.book Page 30 Tuesday, January 29, 2013 1:32 PM