PIC16F87X Datasheet

IC型号：
PIC16F87X
PDF描述：
28/40-pin 8-Bit CMOS FLASH Microcontrollers
文件大小：
1377.31KB
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PIC16F87X

8.1

Capture Mode

8.1.2

TIMER1 MODE SELECTION

In Capture mode, CCPR1H:CCPR1L captures the

16-bit value of the TMR1 register when an event occurs

on pin RC2/CCP1. An event is defined as:

鈥?/div>

Every falling edge

Every rising edge

Every 4th rising edge

Every 16th rising edge

Timer1 must be running in timer mode or synchronized

counter mode for the CCP module to use the capture

feature. In asynchronous counter mode, the capture

operation may not work.

8.1.3

SOFTWARE INTERRUPT

An event is selected by control bits CCP1M3:CCP1M0

(CCP1CON<3:0>). When a capture is made, the inter-

rupt request flag bit CCP1IF (PIR1<2>) is set. The

interrupt flag must be cleared in software. If another

capture occurs before the value in register CCPR1 is

read, the old captured value will be lost.

8.1.1

CCP PIN CONFIGURATION

When the capture mode is changed, a false capture

interrupt may be generated. The user should keep bit

CCP1IE (PIE1<2>) clear to avoid false interrupts and

should clear the flag bit CCP1IF following any such

change in operating mode.

8.1.4

CCP PRESCALER

In Capture mode, the RC2/CCP1 pin should be config-

ured as an input by setting the TRISC<2> bit.

Note:

If the RC2/CCP1 pin is configured as an

output, a write to the port can cause a cap-

ture condition.

There are four prescaler settings, specified by bits

CCP1M3:CCP1M0. Whenever the CCP module is

turned off, or the CCP module is not in capture mode,

the prescaler counter is cleared. Any reset will clear the

prescaler counter.

Switching from one capture prescaler to another may

generate an interrupt. Also, the prescaler counter will

not be cleared, therefore, the first capture may be from

a non-zero prescaler.

Example 8-1

shows the recom-

mended method for switching between capture pres-

calers. This example also clears the prescaler counter

and will not generate the 鈥渇alse鈥?interrupt.

FIGURE 8-1:

CAPTURE MODE OPERATION

BLOCK DIAGRAM

Set flag bit CCP1IF

(PIR1<2>)

Prescaler

梅

1, 4, 16

RC2/CCP1

and

edge detect

EXAMPLE 8-1:

CCPR1L

CCPR1H

Capture

Enable

TMR1H

CCP1CON<3:0>

Q鈥檚

CHANGING BETWEEN

CAPTURE PRESCALERS

CLRF

MOVLW

TMR1L

MOVWF

CCP1CON

;Turn CCP module off

NEW_CAPT_PS ;Load the W reg with

; the new precscaler

; move value and CCP ON

CCP1CON

;Load CCP1CON with this

; value

漏

1999 Microchip Technology Inc.

DS30292A-page 59

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