PIC16F882-I datasheet(127/328 Pages) MICROCHIP

127 / 328 page

DS41291F-page 125

PIC16F882/883/884/886/887

11.2

Capture/Compare/PWM (CCP2)

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 11-2.

Additional information on CCP modules is available in

the Application Note AN594, “Using the CCP Modules”

(DS00594).

TABLE 11-2:

CCP MODE – TIMER

RESOURCES REQUIRED

CCP Mode

Timer Resource

Capture

Timer1

Compare

Timer1

PWM

Timer2

CCP2CON: CCP2 CONTROL REGISTER

U-0

R/W-0

—

DC2B1

DC2B0

CCP2M3

CCP2M2

CCP2M1

CCP2M0

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

DC2B<1:0>: 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 CCPR2L.

bit 3-0

CCP2M<3:0>: CCP2 Mode Select bits

0000

= Capture/Compare/PWM off (resets CCP2 module)

0001

= Unused (reserved)

0010

= Unused (reserved)

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 (CCP2IF bit is set)

1001

= Compare mode, clear output on match (CCP2IF bit is set)

1010

= Compare mode, generate software interrupt on match (CCP2IF bit is set, CCP2 pin

is unaffected)

1011

= Compare mode, trigger special event (CCP2IF bit is set, TMR1 is reset and A/D

conversion is started if the ADC module is enabled. CCP2 pin is unaffected.)

11xx

= PWM mode.

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