PIC16F720-ESLASHML datasheet(109/244 Pages) MICROCHIP

109 / 244 page

 2010 Microchip Technology Inc.

DS41430A-page 109

PIC16F/LF720/721

15.0

CAPTURE/COMPARE/PWM

(CCP) MODULE

The Capture/Compare/PWM module is a peripheral

which allows the user to time and control different

events. In Capture mode, the peripheral allows the

timing of the duration of an event. The Compare mode

allows the user to trigger an external event when a

predetermined amount of time has expired. The PWM

mode can generate a Pulse-Width Modulated signal of

varying frequency and duty cycle.

The timer resources used by the module are shown in

Table 15-1.

Additional information on CCP modules is available in

the Application Note AN594, “Using the CCP Modules”

(DS00594).

TABLE 15-1:

CCP MODE – TIMER

RESOURCES REQUIRED

CCP Mode

Timer Resource

Capture

Timer1

Compare

Timer1

PWM

Timer2

CCP1CON: CCP1 CONTROL REGISTER

U-0

R/W-0

—

DC1

CCP1M3

CCP1M2

CCP1M1

CCP1M0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-6

Unimplemented: Read as ‘0’

bit 5-4

DC1:B1: PWM Duty Cycle 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 CCPR1L.

bit 3-0

CCP1M<3:0>: CCP mode Select bits

0000

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

0001

= Unused (reserved)

0010

= Compare mode, toggle output on match (CCP1IF bit of the PIRx register is set)

0011

= Unused (reserved)

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 (CCP1IF bit of the PIR1 register is set)

1001

= Compare mode, clear output on match (CCP1IF bit of the PIR1 register is set)

1010

= Compare mode, generate software interrupt on match (CCP1IF bit is set of the PIRx register,

CCP1 pin is unaffected)

1011

= Compare mode, trigger special event (CCP1IF bit of the PIR1register is set, TMR1 is reset

and A/D conversion is started if the ADC module is enabled. CCP1 pin is unaffected.)

11xx

= PWM mode.

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