PIC24HJ12GP201ESLASHML datasheet(119/234 Pages) MICROCHIP

119 / 234 page

Preliminary

DS70282B-page 117

PIC24HJ12GP201/202

12.0 INPUT CAPTURE

The input capture module is useful in applications

requiring frequency (period) and pulse measurement.

The PIC24HJ12GP201/202 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 PIC24HJ12GP201/202 devices. It is

not intended to be a comprehensive

reference source. To complement the

information in this data sheet, refer to the

“PIC24H Family Reference Manual”.

Please see the Microchip web site

(www.microchip.com)

for

the

latest

PIC24H

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.

PIC24HJ12GP201E/ML Datasheet(PDF) 119 Page - Microchip Technology

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