PIC18F2331-E/ML MICROCHIP [Microchip Technology], PIC18F2331-E/ML Datasheet - Page 182

• Manufacturer Part Number: PIC18F2331-E/ML
• Description: 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F2331/2431/4331/4431
18.4.2
When the PWM time base is in the Single-Shot mode
(PTMOD<1:0> = 01), an interrupt event is generated
when a match with the PTPER register occurs. The
PWM Time Base register (PTMR) is reset to zero on
the following input clock edge and the PTEN bit is
cleared. The postscaler selection bits have no effect in
this Timer mode.
FIGURE 18-6:
DS39616D-page 182
PTMR_INT_REQ
PTMR_INT_REQ
Note 1: Interrupt flag bit, PTIF, is sampled here (every Q1).
A: PRESCALER = 1:1
B: PRESCALER = 1:4
2: PWM Time Base Period register, PTPER, is loaded with the value, FFFh, for this example.
PTIF bit
PTIF bit
F
PTMR
PTMR
OSC
INTERRUPTS IN SINGLE-SHOT
MODE
/4
Q1
Qc
1
1
Q2
Qc
PWM TIME BASE INTERRUPT TIMING, SINGLE-SHOT MODE
FFEh
FFEh
Q3
Qc
Q4
Qc
Q1
1
Qc
1
2
2
Q2
Qc
FFFh
FFFh
Q3
Qc
Q4
Qc
Qc
Q1
1
1
Q4
Qc
Q2
Q4
18.4.3
In
(PTMOD<1:0> = 10), an interrupt event is generated
each time the value of the PTMR register becomes
zero and the PWM time base begins to count upwards.
The postscaler selection bits may be used in this mode
of the timer to reduce the frequency of the interrupt
events.
Up/Down Count mode.
000h
000h
Q3
Qc
the
Figure 18-7
Q4
Qc
INTERRUPTS IN CONTINUOUS
UP/DOWN COUNT MODE
Continuous
Q1
Qc
Q2
Qc
shows the interrupts in Continuous
000h
000h
Q3
Qc
 2010 Microchip Technology Inc.
Up/Down
Q4
Qc
Q1
Qc
Q2
Qc
Count
000h
000h
Q3
Qc
Q4
Qc
mode