PIC16CR76T-I/SS【PDF 50/172 页】IC PIC MCU 8KX14 28SSOP

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2007 Microchip Technology Inc.

DS39599G-page 141

PIC18F2220/2320/4220/4320

16.0 ENHANCED CAPTURE/

COMPARE/PWM (ECCP)

MODULE

In 40 and 44-pin devices, the CCP1 module is

implemented as a standard CCP module with

enhanced PWM capabilities. Operation of the Capture,

Compare and standard single output PWM modes is

described in Section 15.0 “Capture/Compare/PWM

(CCP) Modules”. Discussion in that section relating to

PWM frequency and duty cycle also apply to the

enhanced PWM mode.

The ECCP module differs from the CCP with the addi-

tion of an enhanced PWM mode which allows for 2 or

4 output channels, user-selectable polarity, dead band

control and automatic shutdown and restart. These

features are discussed in detail in Section 16.4

“Enhanced PWM Mode”.

The control register for CCP1 is shown in Register 16-1.

It differs from the CCP1CON register of PIC18F2X20

devices in that the two Most Significant bits are

implemented to control enhanced PWM functionality.

Note:

The ECCP (Enhanced Capture/ Compare/

PWM) module is only available on

PIC18F4X20 devices.

REGISTER 16-1:

CCP1CON: ECCP CONTROL REGISTER (40/44-PIN DEVICES)

R/W-0

P1M1

P1M0

DC1B1

DC1B0

CCP1M3

CCP1M2

CCP1M1

CCP1M0

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

P1M1:P1M0: PWM Output Configuration bits

If CCP1M3:CCP1M2 = 00, 01, 10 (Capture, Compare or disabled):

xx = P1A assigned as Capture/Compare input; P1B, P1C, P1D assigned as port pins

If CCP1M3:CCP1M2 = 11 (PWM modes):

00 = Single output: P1A modulated; P1B, P1C, P1D assigned as port pins

01 = Full-bridge output forward: P1D modulated; P1A active; P1B, P1C inactive

10 = Half-bridge output: P1A, P1B modulated with dead-band control; P1C, P1D assigned as port pins

11 = Full-bridge output reverse: P1B modulated; P1C active; P1A, P1D inactive

bit 5-4

DC1B1:DC1B0: PWM Duty Cycle Least Significant bits

Capture mode:

Unused.

Compare mode:

Unused.

PWM mode:

These bits are the two LSbs of the 10-bit PWM duty cycle. The eight MSbs of the duty cycle are found

in CCPR1L.

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