Datasheet

 2011-2013 Microchip Technology Inc. DS70657G-page 211
dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X AND PIC24EPXXXGP/MC20X
14.0 INPUT CAPTURE
The input capture module is useful in applications
requiring frequency (period) and pulse measurement.
The dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/
50X and PIC24EPXXXGP/MC20X devices support up
to 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 31 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
FIGURE 14-1: INPUT CAPTURE x MODULE BLOCK DIAGRAM
Note 1: 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 Section 12. “Input Cap-
ture” (DS70352) of the “dsPIC33E/
PIC24E Family Reference Manual”,
which is available from the Microchip web
site (www.microchip.com).
2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
Section 4.0 “Memory Organization” 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
(1)
16
16
16
ICxTMR
Increment
Reset
Note 1: 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