PIC18F23K20-ESLASHML datasheet(174/456 Pages) MICROCHIP

174 / 456 page

PIC18F2XK20/4XK20

DS41303G-page 174

 2010 Microchip Technology Inc.

In addition to the expanded range of modes available

through

the CCP1CON

and

ECCP1AS

associated with Enhanced PWM operation and

auto-shutdown features. They are:

• PWM1CON (Dead-band delay)

• PSTRCON (output steering)

16.1

ECCP Outputs and Configuration

The enhanced CCP module may have up to four PWM

outputs, depending on the selected operating mode.

These outputs, designated P1A through P1D, are

multiplexed with I/O pins on PORTC and PORTD (for

PIC18F4XK20 devices) or PORTB (for PIC18F2XK20

devices). The outputs that are active depend on the

CCP operating mode selected. The pin assignments

are summarized in Table 16-1.

To configure the I/O pins as PWM outputs, the proper

PWM mode must be selected by setting the P1M<1:0>

and CCP1M<3:0> bits. The appropriate TRISC and

TRISD direction bits for the port pins must also be set

as outputs.

16.1.1

ECCP MODULES AND TIMER

RESOURCES

Like the standard CCP modules, the ECCP module can

utilize Timers 1, 2 or 3, depending on the mode

selected. Timer1 and Timer3 are available for modules

in Capture or Compare modes, while Timer2 is

available for modules in PWM mode. Interactions

between the standard and enhanced CCP modules are

identical to those described for standard CCP modules.

Additional details on timer resources are provided in

Section 11.1.1

“CCP

Modules

and

Timer

Resources”.

16.2

Capture and Compare Modes

Except for the operation of the Special Event Trigger

discussed below, the Capture and Compare modes of

the ECCP module are identical in operation to that of

CCP2. These are discussed in detail in Section 11.2

“Capture

Mode”

and

Section 11.3

“Compare

Mode”. No changes are required when moving

between 28-pin and 40/44-pin devices.

16.2.1

SPECIAL EVENT TRIGGER

The Special Event Trigger output of ECCP1 resets the

TMR1 or TMR3 register pair, depending on which timer

resource is currently selected. This allows the CCPR1

16.3

Standard PWM Mode

When configured in Single Output mode, the ECCP

module functions identically to the standard CCP

module in PWM mode, as described in Section 11.4

“PWM Mode”. This is also sometimes referred to as

“Single CCP” mode, as in Table 16-1.

PIC18F23K20-E/ML Datasheet(PDF) 174 Page - Microchip Technology

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