PIC16F72SLASHML datasheet(39/136 Pages) MICROCHIP

39 / 136 page

 2002 Microchip Technology Inc.

DS39597B-page 37

PIC16F72

8.0

CAPTURE/COMPARE/PWM

(CCP) MODULE

The CCP (Capture/Compare/PWM) 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 8-1 shows the timer resources of the CCP

Module modes.

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. All are readable and writable.

Additional information on the CCP module is available

in the PICmicro™ Mid-Range MCU Reference Manual,

(DS33023).

TABLE 8-1:

CCP MODE - TIMER

RESOURCE

CCPCON1:

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

CCP Mode

Timer Resource

Capture

Compare

PWM

Timer1

Timer2

U-0

R/W-0

—

CCPxX

CCPxY

CCPxM3

CCPxM2

CCPxM1

CCPxM0

bit 7

bit 0

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 disabled (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, CCPx 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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