PIC16F87 datasheet(81/230 Pages) MICROCHIP

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DS30487D-page 81

PIC16F87/88

9.0

CAPTURE/COMPARE/PWM

(CCP) MODULE

The Capture/Compare/PWM (CCP) module contains a

16-bit register that can operate as a:

•

16-bit Capture register

•

16-bit Compare register

•

PWM Master/Slave Duty Cycle register.

Table 9-1 shows the timer resources of the CCP

module modes.

Capture/Compare/PWM Register 1 (CCPR1) is com-

prised of two 8-bit registers: CCPR1L (low byte) and

CCPR1H (high byte). The CCP1CON register controls

the operation of CCP1. The special event trigger is

generated by a compare match which will reset Timer1

and start an A/D conversion (if the A/D module is

enabled).

The CCP module’s input/output pin (CCP1) can be

configured as RB0 or RB3. This selection is set in bit 12

(CCPMX) of the Configuration Word.

Additional information on the CCP module is available

in the “PIC® Mid-Range MCU Family Reference Man-

ual” (DS33023) and in Application Note AN594, “Using

the CCP Module(s)” (DS00594).

TABLE 9-1:

CCP MODE – TIMER

RESOURCE

CCP1CON: CAPTURE/COMPARE/PWM CONTROL REGISTER 1 (ADDRESS 17h)

CCP Mode

Timer Resource

Capture

Compare

PWM

Timer1

Timer2

U-0

R/W-0

—

CCP1X

CCP1Y

CCP1M3

CCP1M2

CCP1M1

CCP1M0

bit 7

bit 0

bit 7-6

Unimplemented: Read as ‘0’

bit 5-4

CCP1X:CCP1Y: 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 CCPR1L.

bit 3-0

CCP1M<3:0>: CCP1 Mode Select bits

0000

= Capture/Compare/PWM disabled (resets CCP1 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 (CCP1IF bit is set)

1001

= Compare mode, clear output on match (CCP1IF bit is set)

1010

= Compare mode, generate software interrupt on match (CCP1IF bit is set, CCP1 pin is

unaffected)

1011

= Compare mode, trigger special event (CCP1IF bit is set, CCP1 pin is unaffected); CCP1

resets TMR1 and starts an A/D conversion (if A/D module is enabled)

11xx

=PWM mode

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

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