Datasheet
2009-2016 Microchip Technology Inc. DS60001156J-page 181
PIC32MX5XX/6XX/7XX
16.0 INPUT CAPTURE
The Input Capture module is useful in applications
requiring frequency (period) and pulse measurement.
The Input Capture module captures the 16-bit or 32-bit
value of the selected Time Base registers when an
event occurs at the ICx pin. The following events cause
capture events:
• 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)
• Capture timer value on every edge (rising and
falling), specified edge first.
• 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 between one of
two 16-bit timers (Timer2 or Timer3) for the time base,
or two 16-bit timers (Timer2 and Timer3) together to
form a 32-bit timer. The selected timer can use either
an internal or external clock.
Other operational features include:
• Device wake-up from capture pin during 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
• Input Capture module can also be used to provide
additional sources of external interrupts
FIGURE 16-1: INPUT CAPTURE BLOCK DIAGRAM
Note: This data sheet summarizes the features
of the PIC32MX5XX/6XX/7XX family of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to Section 15. “Input Cap-
ture” (DS60001122) of the “PIC32 Family
Reference Manual”, which is available
from the Microchip web site
(www.microchip.com/PIC32).
Prescaler
1, 4, 16
Edge Detect
FIFO Control
Interrupt
Event
Generation
ICxBUF<31:16>
Interrupt
Timer3
Timer2
ICxCON
ICI<1:0>
ICx Input
0
1
ICxBUF<15:0>
Data Space Interface
Peripheral Data Bus
C32
ICTMR
ICM<2:0>
FEDGE
ICBNE
ICOV
ICM<2:0>