Datasheet

PIC18F1230/1330
 2009 Microchip Technology Inc. DS39758D-page 127
FIGURE 14-6: PWM TIME BASE INTERRUPT TIMING, SINGLE-SHOT MODE
FIGURE 14-7: PWM TIME BASE INTERRUPTS, CONTINUOUS UP/DOWN COUNT MODE
Q2Q1 Q3 Q4Q2Q1 Q3 Q4 Q2Q1 Q3 Q4 Q2Q1 Q3 Q4 Q2Q1 Q3 Q4
1
1
F
OSC/4
PTMR
FFEh FFFh 000h 000h 000h
1
PTIF bit
2
Note 1: Interrupt flag bit, PTIF, is sampled here (every Q1).
2: PWM Time Base Period register, PTPER, is loaded with the value FFFh for this example.
QcQc Qc QcQcQc Qc Qc QcQc Qc Qc QcQc Qc Qc QcQc Qc Qc
1
1
PTMR
FFEh FFFh 000h 000h
1
2
A: PRESCALER = 1:1
B: PRESCALER = 1:4
PTMR_INT_REQ
Q4Q4
PTIF bit
PTMR_INT_REQ
000h
Q2Q1 Q3 Q4Q2Q1 Q3 Q4 Q2Q1 Q3 Q4 Q2Q1 Q3 Q4 Q2Q1 Q3 Q4
FOSC/4
PTMR
002h 001h 000h 001h 002h
Note 1: Interrupt flag bit, PTIF, is sampled here (every Q1).
QcQc Qc QcQcQc Qc Qc QcQc Qc Qc QcQc Qc Qc QcQc Qc Qc
1
1
PTMR 002h
001h 001h
002h
1
PTDIR bit
1
PRESCALER = 1:1
PRESCALER = 1:4
PTIF bit
PTMR_INT_REQ
PTDIR bit
Q4Q4
PTIF bit
PTMR_INT_REQ
1
1 1 1
000h