PIC18LF4331 datasheet(182/392 Pages) MICROCHIP

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PIC18F2331/2431/4331/4431

DS39616D-page 182

 2010 Microchip Technology Inc.

18.4.2

INTERRUPTS IN SINGLE-SHOT

MODE

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.

18.4.3

INTERRUPTS IN CONTINUOUS

UP/DOWN COUNT MODE

the

Continuous

Up/Down

Count

mode

(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. Figure 18-7 shows the interrupts in Continuous

Up/Down Count mode.

FIGURE 18-6:

PWM TIME BASE INTERRUPT TIMING, SINGLE-SHOT MODE

FOSC/4

PTMR

FFEh

FFFh

000h

PTIF bit

Note 1:

Interrupt flag bit, PTIF, is sampled here (every Q1).

PWM Time Base Period register, PTPER, is loaded with the value, FFFh, for this example.

PTMR

FFEh

FFFh

000h

A: PRESCALER = 1:1

B: PRESCALER = 1:4

PTMR_INT_REQ

PTIF bit

PTMR_INT_REQ

000h

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