PIC18LF4520ESLASHSPQTP datasheet(150/390 Pages) MICROCHIP

150 / 390 page

PIC18F2420/2520/4420/4520

DS39631A-page 148

Preliminary

 2004 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. It is:

• PWM1CON (Dead-band delay)

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. 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

selected

setting

the

P1M1:P1M0

and

CCP1M3:CCP1M0

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 avail-

able 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 15.1.1

“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 15.2

“Capture

Mode”

and

Section 15.3

“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 15.4

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

“Compatible CCP” mode, as in Table 16-1.

TABLE 16-1:

PIN ASSIGNMENTS FOR VARIOUS ECCP1 MODES

Note:

When setting up single output PWM opera-

tions, users are free to use either of the pro-

cesses described in Section 15.4.4 “Setup

for PWM Operation” or Section 16.4.9

“Setup for PWM Operation”. The latter is

more generic and will work for either single

or multi-output PWM.

ECCP Mode

CCP1CON

Configuration

RC2

RD5

RD6

RD7

All 40/44-pin devices:

Compatible CCP

00xx 11xx

CCP1

RD5/PSP5

RD6/PSP6

RD7/PSP7

Dual PWM

10xx 11xx

P1A

P1B

RD6/PSP6

RD7/PSP7

Quad PWM

x1xx 11xx

P1A

P1B

P1C

P1D

Legend: x = Don’t care. Shaded cells indicate pin assignments not used by ECCP1 in a given mode.

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