Datasheet

 2013-2014 Microchip Technology Inc. DS70000689D-page 219
dsPIC33EPXXXGM3XX/6XX/7XX
14.0 INPUT CAPTURE
The input capture module is useful in applications
requiring frequency (period) and pulse measurement.
The dsPIC33EPXXXGM3XX/6XX/7XX devices support
up to eight 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 dsPIC33EPXXXGM3XX/6XX/7XX
family of devices. It is not intended to be a
comprehensive reference source. To com-
plement the information in this data sheet,
refer to the “dsPIC33/PIC24 Family
Reference Manual”, “Input Capture”
(DS70000352), 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
ICx 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