PIC24F04KA201 datasheet(111/224 Pages) MICROCHIP

111 / 224 page

Preliminary

DS39937B-page 109

PIC24F04KA201 FAMILY

13.0

INPUT CAPTURE

The input capture module is used to capture a timer

value from one of two selectable time bases upon an

event on an input pin.

The input capture features are quite useful in

applications requiring frequency (Time Period) and

pulse measurement. Figure 13-1 depicts a simplified

block diagram of the input capture module.

The PIC24F04KA201 family devices have one input

capture channel. The input capture module has

multiple operating modes, which are selected via the

IC1CON register. The operating modes include:

• Capture timer value on every falling edge of input

applied at the IC1 pin

• Capture timer value on every rising edge of input

applied at the IC1 pin

• Capture timer value on every 4th rising edge of

input applied at the IC1 pin

• Capture timer value on every 16th rising edge of

input applied at the IC1 pin

• Capture timer value on every rising and every

falling edge of input applied at the IC1 pin

• Device wake-up from capture pin during CPU

Sleep and Idle modes

The input capture module has a four-level FIFO buffer.

The number of capture events required to generate a

CPU interrupt can be selected by the user.

FIGURE 13-1:

INPUT CAPTURE BLOCK DIAGRAM

Note:

This data sheet summarizes the features

of this group of PIC24F devices. It is not

intended to be a comprehensive reference

source. For more information on Input

Capture, refer to the “PIC24F Family

Reference Manual”

, Section 15. “Input

Capture”

(DS39701).

IC1BUF

IC1 Pin

ICM<2:0> (IC1CON<2:0>)

Mode Select

Set Flag IC1IF

(in IFSn Register)

TMRy TMRx

Edge Detection Logic

FIFO

R/W

Logic

ICI<1:0>

ICOV, ICBNE (IC1CON<4:3>)

IC1CON

Interrupt

Logic

System Bus

From 16-Bit Timers

ICTMR

(IC1CON<7>)

Prescaler

Counter

(1, 4, 16)

Clock Synchronizer

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