PIC16LF870SLASHSP datasheet(57/156 Pages) MICROCHIP

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Preliminary

DS30569A -page 57

PIC16F870/871

8.0

CAPTURE/COMPARE/PWM

MODULE

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

16-bit register which can operate as a:

• 16-bit Capture register

• 16-bit Compare register

• PWM master/slave Duty Cycle register

Table 8-1 shows the resources used by the CCP mod-

ule. In the following sections, the operation of a CCP

module is described.

CCP1 Module:

Capture/Compare/PWM Register1 (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 gen-

erated by a compare match and will reset Timer1 and

start an A/D conversion (if the A/D module is enabled).

Additional information on CCP modules is available in

the PICmicro™ Mid-Range MCU Family Reference

Manual (DS33023) and in Application Note 594, “Using

the CCP Modules” (DS00594).

TABLE 8-1:

CCP MODE - TIMER

RESOURCES REQUIRED

CCP1CON REGISTER (ADDRESS: 17h)

CCP Mode

Timer Resource

Capture

Compare

PWM

Timer1

Timer2

U-0

R/W-0

—

CCP1X

CCP1Y

CCP1M3

CCP1M2

CCP1M1

CCP1M0

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: CCP1<X:Y>: 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>: CCPx Mode Select bits

0000

= Capture/Compare/PWM off (resets CCP 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, CCP 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

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