
PIC18F6585/8585/6680/8680
DS30491C-page 30
2004 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
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
TOSC
TSCS
1
23
45
6
78
Counter