PIC32MX795F512LT-80ISLASHPF datasheet(139/256 Pages) MICROCHIP

139 / 256 page

DS61156G-page 139

PIC32MX5XX/6XX/7XX

15.0 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 CPU

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 can also be used to provide

additional sources of external interrupts

FIGURE 15-1:

INPUT CAPTURE BLOCK DIAGRAM

Note 1:

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

Capture”

(DS61122) of the “PIC32

Family Reference Manual”

, which is

available from the Microchip web site

(www.microchip.com/PIC32).

Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization”

this data sheet for device-specific register

and bit information.

Prescaler

1, 4, 16

Edge Detect

FIFO Control

Interrupt

Event

Generation

ICxBUF<31:16>

Interrupt

Timer3 Timer2

ICxCON

ICI<1:0>

ICx Input

ICxBUF<15:0>

Data Space Interface

Peripheral Data Bus

C32

ICTMR

ICM<2:0>

FEDGE

ICBNE

ICOV

ICM<2:0>

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