PIC16C72 datasheet(72/288 Pages) MICROCHIP

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PIC16C7X

DS30390E-page 72

FIGURE 10-1: CCP1CON REGISTER (ADDRESS 17h)/CCP2CON REGISTER (ADDRESS 1Dh)

U-0

R/W-0

—

CCPxX

CCPxY

CCPxM3

CCPxM2

CCPxM1 CCPxM0

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as ‘0’

- n =Value at POR reset

bit7

bit0

bit 7-6:

Unimplemented: Read as '0'

bit 5-4: CCPxX:CCPxY: PWM Least Signiﬁcant bits

Capture Mode: Unused

Compare Mode: Unused

PWM Mode: These bits are the two LSbs of the PWM duty cycle. The eight MSbs are found in CCPRxL.

bit 3-0: CCPxM3:CCPxM0: CCPx Mode Select bits

0000

= Capture/Compare/PWM off (resets CCPx module)

0100

= Capture mode, every falling edge

0101

= Capture mode, every rising edge

0110

= Capture mode, every 4th rising edge

0111

= Capture mode, every 16th rising edge

1000

= Compare mode, set output on match (CCPxIF bit is set)

1001

= Compare mode, clear output on match (CCPxIF bit is set)

1010

= Compare mode, generate software interrupt on match (CCPxIF bit is set, CCPx pin is unaffected)

1011

= Compare mode, trigger special event (CCPxIF bit is set; CCP1 resets TMR1; CCP2 resets TMR1

and starts an A/D conversion (if A/D module is enabled))

11xx

= PWM mode

10.1

Capture Mode

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:

• Every falling edge

• Every rising edge

• Every 4th rising edge

• Every 16th rising edge

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. It must

be cleared in software. If another capture occurs before

the value in register CCPR1 is read, the old captured

value will be lost.

10.1.1

CCP PIN CONFIGURATION

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

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

Applicable Devices

72 73 73A 74 74A 76 77

Note:

If the RC2/CCP1 is conﬁgured as an out-

put, a write to the port can cause a capture

condition.

FIGURE 10-2: CAPTURE MODE

OPERATION BLOCK

DIAGRAM

10.1.2

TIMER1 MODE SELECTION

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.

10.1.3

SOFTWARE INTERRUPT

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.

CCPR1H

CCPR1L

TMR1H

TMR1L

Set ﬂag bit CCP1IF

(PIR1<2>)

Capture

Enable

Q’s

CCP1CON<3:0>

RC2/CCP1

Prescaler

÷ 1, 4, 16

and

edge detect

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