Microchip Technology MA330031-2 Data Sheet

 2011-2013 Microchip Technology Inc.

DS70000657H-page 213

The input capture module is useful in applications
requiring frequency (period) and pulse measurement.
The dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/
50X and PIC24EPXXXGP/MC20X devices support
four input capture channels.
Key features of the input capture module include:
• Hardware-configurable for 32-bit operation in all 

modes by cascading two adjacent modules

• Synchronous and Trigger modes of output 

compare operation, with up to 19 user-selectable 
Trigger/Sync sources available

• A 4-level FIFO buffer for capturing and holding 

timer values for several events

• Configurable interrupt generation
• Up to six clock sources available for each module, 

driving a separate internal 16-bit counter

This data sheet summarizes the
features of the dsPIC33EPXXXGP50X,
dsPIC33EPXXXMC20X/50X and
PIC24EPXXXGP/MC20X families of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to “Input Capture”
(DS70352) in the “dsPIC33/dsPIC24
Family Reference Manual

”, which is

available from the Microchip web site
(

www.microchip.com

).

Some registers and associated bits
described in this section may not be
available on all devices. Refer to

 in

this data sheet for device-specific register
and bit information.

ICxBUF

4-Level FIFO Buffer

ICx Pin

ICM<2:0>

Set ICxIF

Edge Detect Logic

ICI<1:0>

ICOV, ICBNE

Interrupt

Logic

System Bus

Prescaler

Counter
1:1/4/16

and

Clock Synchronizer

Event and

Trigger and

Sync Logic

Clock

Select

IC Clock
Sources

Trigger and
Sync Sources

ICTSEL<2:0>

SYNCSEL<4:0>
Trigger

16

16

16

ICxTMR

Increment

Reset

The Trigger/Sync source is enabled by default and is set to Timer3 as a source. This timer must be enabled for 
proper ICx module operation or the Trigger/Sync source must be changed to another source option.

PTG Trigger

Input

CTMU Edge

Control Logic