DSPIC33FJ12MC02ESS datasheet(139/284 Pages) MICROCHIP

139 / 284 page

Preliminary

DS70265B-page 137

dsPIC33FJ12MC201/202

12.0 INPUT CAPTURE

The input capture module is useful in applications

requiring frequency (period) and pulse measurement.

The dsPIC33FJ12MC201/202 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 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

• Use of input capture to provide additional sources

of external interrupts

FIGURE 12-1:

INPUT CAPTURE BLOCK DIAGRAM

Note:

This data sheet summarizes the features

of the dsPIC33FJ12MC201/202 devices.

It is not intended to be a comprehensive

reference source. To complement the

information in this data sheet, refer to the

“dsPIC33F Family Reference Manual”.

Please see the Microchip web site

(www.microchip.com)

for

the

latest

dsPIC33F Family Reference Manual

chapters.

ICxBUF

ICx Pin

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

Mode Select

Set Flag ICxIF

(in IFSn Register)

TMR2 TMR3

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.

DSPIC33FJ12MC02ESS 数据表(PDF) 139 Page - Microchip Technology

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