Microchip Technology DM183021 Data Sheet
2010 Microchip Technology Inc.
DS39616D-page 183
PIC18F2331/2431/4331/4431
FIGURE 18-7:
PWM TIME BASE INTERRUPT, CONTINUOUS UP/DOWN COUNT MODE
Q2
Q1
Q3
Q4
Q2
Q1
Q3
Q4
Q2
Q1
Q3
Q4
Q2
Q1
Q3
Q4
Q2
Q1
Q3
Q4
F
OSC
/4
PTMR
002h
001h
000h
001h
002h
Note 1:
Interrupt flag bit, PTIF, is sampled here (every Q1).
Qc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
Qc
1
1
PTMR
002h
001h
001h
002h
1
PTDIR bit
1
A: PRESCALER = 1:1
B: PRESCALER = 1:4
PTIF bit
PTMR_INT_REQ
PTDIR bit
Q4
Q4
PTIF bit
PTMR_INT_REQ
1
1
1
1
000h