16F628 datasheet(57/168 Pages) MICROCHIP

57 / 168 page

 2002 Microchip Technology Inc.

Preliminary

DS40044A-page 55

PIC16F627A/628A/648A

9.0

CAPTURE/COMPARE/PWM

(CCP) MODULE

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

16-bit register which can operate as a 16-bit capture

master/slave Duty Cycle register. Table 9-1 shows the

timer resources of the CCP module modes.

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. All are readable and writable.

Additional information on the CCP module is available

in the PICmicro™ Mid-Range Reference Manual,

(DS33023).

TABLE 9-1:

CCP MODE - TIMER

RESOURCE

CCP1CON REGISTER (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

CCPRxL.

bit 3-0

CCP1M3:CCP1M0: CCPx Mode Select bits

0000 = Capture/Compare/PWM off (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 resets TMR1

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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