PIC18F25J11-I/PT MICROCHIP [Microchip Technology], PIC18F25J11-I/PT Datasheet - Page 43

• Manufacturer Part Number: PIC18F25J11-I/PT
• Description: 28/44-Pin, Low-Power, High-Performance Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

On transitions from SEC_RUN mode to PRI_RUN
mode, the peripherals and CPU continue to be clocked
from the Timer1 oscillator while the primary clock is
started. When the primary clock becomes ready, a
clock switch back to the primary clock occurs (see
FIGURE 3-1:
FIGURE 3-2:
© 2009 Microchip Technology Inc.
Peripheral
Program
Counter
T1OSI
OSC1
Note 1: T
Clock
Clock
CPU Clock
CPU
PLL Clock
Peripheral
Program
Counter
Output
T1OSI
OSC1
Clock
Q1
SCS<1:0> Bits Changed
OST
Q2
TRANSITION TIMING FOR ENTRY TO SEC_RUN MODE
TRANSITION TIMING FROM SEC_RUN MODE TO PRI_RUN MODE (HSPLL)
PC
= 1024 T
Q3
Q4
Q1
OSC
Q1
T
; T
OST
1
PLL
(1)
PC
Q2
= 2 ms (approx). These intervals are not shown to scale.
2
Clock Transition
T
3
PLL (1)
OSTS Bit Set
Q3
Q4
PC + 2
n-1
PIC18F46J11 FAMILY
Figure 3-2). When the clock switch is complete, the
T1RUN bit is cleared, the OSTS bit is set and the
primary clock would be providing the clock. The IDLEN
and SCS bits are not affected by the wake-up; the
Timer1 oscillator continues to run.
Q1
1
n
Transition
2
Clock
n-1 n
Q2
PC + 2
Q3
Q2
Q4
Q3 Q4
Q1
Q1
PC + 4
Q2
Q2
PC + 4
DS39932C-page 43
Q3
Q3