DSPIC30F datasheet(79/220 Pages) MICROCHIP

79 / 220 page

 2004 Microchip Technology Inc.

Preliminary

DS70116C-page 77

dsPIC30F5011/5013

12.0

INPUT CAPTURE MODULE

This section describes the input capture module and

associated Operational modes. The features provided

by this module are useful in applications requiring fre-

quency (period) and pulse measurement. Figure 12-1

depicts a block diagram of the input capture module.

Input capture is useful for such modes as:

• Frequency/Period/Pulse Measurements

• Additional Sources of External Interrupts

The key operational features of the input capture

module are:

• Simple Capture Event mode

• Timer2 and Timer3 mode selection

• Interrupt on input capture event

These Operating modes are determined by setting the

appropriate bits in the ICxCON register (where

x = 1,2,...,N). The dsPIC devices contain up to 8

capture channels (i.e., the maximum value of N is 8).

FIGURE 12-1:

INPUT CAPTURE MODE BLOCK DIAGRAM

12.1

Simple Capture Event Mode

The simple capture events in the dsPIC30F product

family are:

• Capture every falling edge

• Capture every rising edge

• Capture every 4th rising edge

• Capture every 16th rising edge

• Capture every rising and falling edge

These simple Input Capture modes are configured by

setting the appropriate bits ICM<2:0> (ICxCON<2:0>).

12.1.1

CAPTURE PRESCALER

There are four input capture prescaler settings speci-

fied by bits ICM<2:0> (ICxCON<2:0>). Whenever the

capture channel is turned off, the prescaler counter will

be cleared. In addition, any Reset will clear the

prescaler counter.

ICxBUF

Prescaler

ICx pin

ICM<2:0>

Mode Select

Note:

Where ‘x’ is shown, reference is made to the registers or bits associated to the respective input capture

channels 1 through N.

Set Flag

ICxIF

ICTMR

T2_CNT

T3_CNT

Edge

Detection

Logic

Clock

Synchronizer

1, 4, 16

From GP Timer Module

FIFO

R/W

Logic

ICI<1:0>

ICBNE, ICOV

ICxCON

Interrupt

Logic

Set Flag

ICxIF

Data Bus

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