F21 datasheet(176/416 Pages) MICROCHIP

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PIC24FJ256GA705 FAMILY

DS30010118D-page 176

 2016-2018 Microchip Technology Inc.

FIGURE 15-2:

OUTPUT COMPARE x BLOCK DIAGRAM (DOUBLE-BUFFERED,

16-BIT PWM MODE)

15.3.1

PWM PERIOD

The PWM period is specified by writing to PRy, the

Timer Period register. The PWM period can be

calculated using Equation 15-1.

EQUATION 15-1:

CALCULATING THE PWM PERIOD(1)

Comparator

OCxTMR

OCxCON1

OCxCON2

OCx Interrupt

OCx Pin(1)

OCxRS Buffer

Comparator

Match

Trigger and

Sync Logic

Clock

Select

Increment

Reset

OCx Clock

Sources

Trigger and

Sync Sources

Reset

Match Event

OCFA/OCFB(2)

OCTSEL<2:0>

SYNCSEL<4:0>

TRIGSTAT

TRIGMODE

OCTRIG

OCM<2:0>

OCINV

OCTRIS

FLTOUT

FLTTRIEN

FLTMD

ENFLT<2:0>

OCFLT<2:0>

OCxRS

Event

Rollover

Rollover/Reset

Note 1:

The OCx outputs must be assigned to an available RPn pin before use. See Section 11.5 “Peripheral Pin

Select (PPS)” for more information.

The OCFA/OCFB Fault inputs must be assigned to an available RPn/RPIn pin before use. See Section 11.5

“Peripheral Pin Select (PPS)” for more information.

OCxR and

DCB<1:0>

OCxR and

DCB<1:0> Buffers

OCx Output and

Fault Logic

Note 1:

Based on TCY = TOSC * 2; Doze mode and PLL are disabled.

PWM Period = [(PRy) + 1 • TCY • (Timer Prescale Value)

Where:

PWM Frequency = 1/[PWM Period]

Note:

A PRy value of N will produce a PWM period of N + 1 time base count cycles. For example, a value of

seven, written into the PRy register, will yield a period consisting of eight time base cycles.

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