DSPIC30F5015 datasheet(79/236 Pages) MICROCHIP

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DS70135E-page 77

dsPIC30F4011/4012

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

frequency (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 dsPIC30F4011/4012 devices have 4 capture

channels.

FIGURE 12-1:

INPUT CAPTURE MODE BLOCK DIAGRAM

Note: This data sheet summarizes features of this group

of dsPIC30F devices and is not intended to be a complete

reference source. For more information on the CPU,

peripherals, register descriptions and general device

functionality, refer to the dsPIC30F Family Reference

Manual (DS70046). For more information on the device

instruction set and programming, refer to the “dsPIC30F/

33F Programmer’s Reference Manual” (DS70157).

Note:

The dsPIC30F4011/4012 devices have

four capture inputs: IC1, IC2, IC7 and IC8.

The naming of these four capture chan-

nels is intentional and preserves software

compatibility with other dsPIC Digital

Signal Controllers.

ICxBUF

Prescaler

ICx

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 Timer Module

FIFO

R/W

Logic

ICI<1:0>

ICBNE, ICOV

ICxCON

Interrupt

Logic

Set Flag

ICxIF

Data Bus

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