DM163006 datasheet(141/320 Pages) MICROCHIP

141 / 320 page

 2001 Microchip Technology Inc.

Advance Information

DS39541A-page 141

PIC18C601/801

14.0

CAPTURE/COMPARE/PWM

(CCP) MODULES

Each CCP (Capture/Compare/PWM) module contains

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

Duty Cycle register. Table 14-1 shows the timer

resources of the CCP module modes.

The operation of CCP1 is identical to that of CCP2, with

the exception of the special event trigger. Therefore,

operation of a CCP module in the following sections is

described, with respect to CCP1.

Table 14-2 shows the interaction of the CCP modules.

(CCPxCON). For the CCP1 module, the register is

called CCP1CON and for the CCP2 module, the regis-

ter is called CCP2CON.

CCP1CON REGISTER

CCP2CON REGISTER

U-0

R/W-0

CCP1CON

—

DC1B1

DC1B0

CCP1M3

CCP1M2

CCP1M1

CCP1M0

bit 7

bit 0

U-0

R/W-0

CCP2CON

—

DC2B1

DC2B0

CCP2M3

CCP2M2

CCP2M1

CCP2M0

bit 7

bit 0

bit 7-6

Unimplemented: Read as '0'

bit 5-4

DCxB1:DCxB0: PWM Duty Cycle bit1 and bit0

Capture mode:

Unused

Compare mode:

Unused

PWM mode:

These bits are the two LSbs (bit1 and bit0) of the 10-bit PWM duty cycle. The upper eight bits

(DCx9:DCx2) of the duty cycle are found in CCPRxL.

bit 3-0

CCPxM3:CCPxM0: CCPx Mode Select bits

0000

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

0001

= Reserved

0010

= Compare mode, toggle output on match (CCPxIF bit is set)

0011

= 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,

Initialize CCP pin Low, on compare match force CCP pin High (CCPIF bit is set)

1001

= Compare mode,

Initialize CCP pin High, on compare match force CCP pin Low (CCPIF bit is set)

1010

= Compare mode,

Generate software interrupt on compare match

(CCPIF bit is set, CCP pin is unaffected)

1011

= Compare mode,

Trigger special event (CCPIF bit is set, reset TMR1 or TMR3)

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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