pic32mx320f032h Microchip Technology Inc., pic32mx320f032h Datasheet - Page 79

• Manufacturer Part Number: pic32mx320f032h
• Description: 64/100-pin General Purpose And Usb 32-bit Flash Microcontrollers
• Manufacturer: Microchip Technology Inc.

15.0
The Input Capture module is useful in applications
requiring frequency (period) and pulse measurement.
The PIC32MX3XX/4XX devices support up to five input
capture channels.
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 events that cause a
capture event are listed below in three categories:
1.
FIGURE 15-1:
© 2009 Microchip Technology Inc.
Note:
- Capture timer value on every falling edge of
- Capture timer value on every rising edge of
Simple Capture Event modes
input at ICx pin
input at ICx pin
INPUT CAPTURE
ICM<2:0>
Prescaler
1, 4, 16
reference source. Refer to the “PIC32MX
description of this peripheral.
This data sheet summarizes the features of
the PIC32MX3XX/4XX family of devices. It
is not intended to be a comprehensive
Family Reference Manual” Section 15.
“Input Capture” (DS61122) for a detailed
The manual is available from the Microchip
web site (www.Microchip.com/PIC32).
ICx Input
INPUT CAPTURE BLOCK DIAGRAM
ICM<2:0>
ICFEDGE
Edge Detect
ICxCON
FIFO Control
ICI<1:0>
ICBNE
ICOV
Preliminary
ICTMR
ICC32
Generation
2.
3.
4.
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 CPU
• Interrupt on input capture event
• 4-word FIFO buffer for capture values
• Input capture can also be used to provide
Interrupt
Interrupt
Event
- Capture timer value on every 4th rising edge
- Capture timer value on every 16th rising
Sleep and Idle modes
- Interrupt optionally generated after 1, 2, 3 or
additional sources of external interrupts
ICxBUF<31:16>
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
of input at ICx pin
edge of input at ICx pin
4 buffer locations are filled
PIC32MX3XX/4XX
Data Space Interface
Peripheral Data Bus
ICxBUF<15:0>
Timer 3 Timer 2
0
DS61143F-page 77
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