DSPIC33FJ64GP706 datasheet(167/322 Pages) MICROCHIP

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DS70286C-page 165

dsPIC33FJXXXGPX06/X08/X10

14.0 INPUT CAPTURE

The input capture module is useful in applications

requiring frequency (period) and pulse measurement.

The dsPIC33FJXXXGPX06/X08/X10 devices support

up to eight input capture channels.

The input capture module captures the 16-bit value of

the selected Time Base register when an event occurs

at the ICx pin. The events that cause a capture event

are listed below in three categories:

Simple Capture Event modes

-Capture timer value on every falling edge of

input at ICx pin

-Capture timer value on every rising edge of

input at ICx pin

Capture timer value on every edge (rising and

falling)

Prescaler Capture Event modes

-Capture timer value on every 4th rising edge

of input at ICx pin

-Capture timer value on every 16th rising

edge of input at ICx pin

Each input capture channel can select between one of

two 16-bit timers (Timer2 or Timer3) for the time base.

The selected timer can use either an internal or

external clock.

Other operational features include:

• Device wake-up from capture pin during CPU

Sleep and Idle modes

• Interrupt on input capture event

• 4-word FIFO buffer for capture values

- Interrupt optionally generated after 1, 2, 3 or

4 buffer locations are filled

• Input capture can also be used to provide

additional sources of external interrupts

FIGURE 14-1:

INPUT CAPTURE BLOCK DIAGRAM

Note:

This data sheet summarizes the features

of the dsPIC33FJXXXGPX06/X08/X10

family of devices. However, it is not

intended to be a comprehensive reference

source. To complement the information in

this data sheet, refer to Section 12.

“Input Capture” (DS70198) in the

“dsPIC33F Family Reference Manual”,

which is available from the Microchip web

site (www.microchip.com).

Note:

Only IC1 and IC2 can trigger a DMA data

transfer. If DMA data transfers are

required, the FIFO buffer size must be set

to 1 (ICI<1:0> = 00).

ICxBUF

ICx Pin

ICM<2:0> (ICxCON<2:0>)

Mode Select

Set Flag ICxIF

(in IFSn Register)

TMRy TMRz

Edge Detection Logic

FIFO

R/W

Logic

ICxI<1:0>

ICOV, ICBNE (ICxCON<4:3>)

ICxCON

Interrupt

Logic

System Bus

From 16-bit Timers

ICTMR

(ICxCON<7>)

Prescaler

Counter

(1, 4, 16)

and

Clock Synchronizer

Note: An ‘x’ in a signal, register or bit name denotes the number of the capture channel.

DSPIC33FJ64GP706 Datasheet(PDF) 167 Page - Microchip Technology

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