Datasheet
© 2009-2012 Microchip Technology Inc. Preliminary DS70616F-page 279
dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
14.0 INPUT CAPTURE
The Input Capture module is useful in applications
requiring frequency (period) and pulse measurement.
The dsPIC33EPXXX(GP/MC/MU)806/810/814 and
PIC24EPXXX(GP/GU)810/814 devices support up to
16 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 30 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 MODULE BLOCK DIAGRAM
Note 1: This data sheet summarizes the features
of the dsPIC33EPXXX(GP/MC/MU)806/
810/814 and PIC24EPXXX(GP/GU)810/
814 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
Capture” (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.
Note: Only IC1, IC2, IC3 and IC4 can trigger a
DMA data transfer. If DMA data transfers
are required, the FIFO buffer size must be
set to ‘1’ (ICI<1:0> = 00)
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
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.
F
P
T1CLK
T5CLK