Microchip Technology dsPIC33F Family Manual de usuario descargar pdf (Pagina 2)

dsPIC33F Family Reference Manual

12.1 INTRODUCTION

This section describes the Input Capture module and its associated operational modes. The

Input Capture module is used to capture a timer value from one of the two selectable time bases

upon an event on an input pin. The Input Capture features are quite useful in applications that

require frequency (time period) and pulse measurement. Figure 12-1 depicts a simplified block

diagram of the Input Capture module.

The Input Capture module has multiple operating modes. The operating modes are selected via

the Input Capture Control (ICxCON) register and include:

• Capture timer value on every falling edge of the input applied at the ICx pin

• Capture timer value on every rising edge of the input applied at the ICx pin

• Capture timer value on every 4th rising edge of the input applied at the ICx pin

• Capture timer value on every 16th rising edge of the input applied at the ICx pin

• Capture timer value on every rising and every falling edge of the input applied at the ICx pin

• Device wake-up from Sleep and Idle mode on the rising edge of the input applied at the ICx

The Input Capture module has a four level First-In First-Out (FIFO) buffer. The user-assigned

application can select the number of capture events required to generate a CPU interrupt.

Figure 12-1: Input Capture Block Diagram

Note: Each dsPIC33F device variant has one or more Input Capture modules. An ‘x’ used

in the names of pins, control/status bits and registers denotes the particular Input

Capture module number. Refer to the specific device data sheets for more details.

FIFO CONTROL

ICxBUF

TMR2 TMR3

Capture

Event

FIFO

ICI<1:0>

ICM<2:0>

101

100

011

010

001

111

To CPU

Set Flag ICxIF

(in IFSx Register)

Rising Edge Mode

Prescaler Mode

(4th Rising Edge)

Falling Edge Mode

Edge Detection

Prescaler Mode

(16th Rising Edge)

Sleep/Idle

Wake-up Mode

ICTMR

ICx pin

Mode

1 2 3 4 5 6 7 ... 15 16

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Microchip Technology dsPIC33F Family Manual de usuario Pagina 2

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