PIC18F83J11T-I/PT【PDF 78/332 页】IC PIC MCU FLASH 4KX16 80TQFP

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Sheet目录3871

74页 75页 76页 77页 [78页]79页 80页 81页 82页

2010 Microchip Technology Inc.

DS39774D-page 169

PIC18F85J11 FAMILY

16.0 CAPTURE/COMPARE/PWM

(CCP) MODULES

PIC18F85J11

family

devices

have

two

CCP

(Capture/Compare/PWM) modules, designated CCP1

and CCP2. Both modules implement standard Capture,

Compare and Pulse-Width Modulation (PWM) modes.

Each CCP module contains a 16-bit register which can

operate as a 16-bit Capture register, a 16-bit Compare

For the sake of clarity, all CCP module operation in the

following sections is described with respect to CCP2,

but is equally applicable to CCP1.

REGISTER 16-1:

CCPxCON: CCPx CONTROL REGISTER (CCP1, CCP2 MODULES)

U-0

R/W-0

—

DCxB1

DCxB0

CCPxM3

CCPxM2

CCPxM1

CCPxM0

bit 7

bit 0

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

bit 7-6

Unimplemented: Read as ‘0’

bit 5-4

DCxB<1:0>: PWM Duty Cycle bit 1 and bit 0 for CCPx Module

Capture mode:

Unused.

Compare mode:

Unused.

PWM mode:

These bits are the two Least Significant bits (bit 1 and bit 0) of the 10-bit PWM duty cycle. The eight

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

bit 3-0

CCPxM<3:0>: CCPx Module Mode Select bits

0000

= Capture/Compare/PWM disabled (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 CCPx pin low; on compare match, force CCPx pin high (CCPxIF bit

is set)

1001

= Compare mode: initialize CCPx pin high; on compare match, force CCPx pin low (CCPxIF bit

is set)

1010

= Compare mode: generate software interrupt on compare match (CCPxIF bit is set, CCPx pin

reflects I/O state)

1011

= Compare mode: Special Event Trigger; reset timer; start A/D conversion on CCPx match

(CCPxIF bit is set)(1)

11xx

=PWM mode

Note 1:

CCPxM<3:0> = 1011 will only reset the timer and not start an A/D conversion on CCPx match.

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