PIC18F2331 Datasheet, PDF (282/396 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D

PIC18F2331/2431/4331/4431
FIGURE 22-2:
INTOSC
Multiplexer
OSC1
PLL Clock
Output
TIMING TRANSITION FOR TWO-SPEED START-UP (INTOSC TO HSPLL)
Q1
Q2
Q3
Q4 Q1
Q2 Q3 Q4 Q1 Q2 Q3 Q4
TOST⁽¹⁾
TPLL⁽¹⁾
12345678
Clock Transition
CPU Clock
Peripheral
Clock
Program
Counter
PC
PC + 2
PC + 4
PC + 6
Wake from Interrupt Event
OSTS bit Set
Note 1: TOST = 1024 TOSC; TPLL = 2 ms (approx). These intervals are not shown to scale.
DS39616B-page 280
Preliminary
 2003 Microchip Technology Inc.