PIC18F4580-ESLASHML datasheet(178/490 Pages) MICROCHIP

178 / 490 page

PIC18F2480/2580/4480/4580

DS39637D-page 178

In addition to the expanded range of modes available

through the CCP1CON register, the ECCP module has

two additional registers associated with Enhanced

PWM operation and auto-shutdown features. They are:

• ECCP1DEL (Dead-Band Delay)

• ECCP1AS (Auto-Shutdown Control)

17.1

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 17-1.

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

PWM mode must be selected by setting the

EPWM1M<1:0> and CCP1M<3:0> bits. The appropriate

TRISC and TRISD direction bits for the port pins must

also be set as outputs.

17.1.1

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 16.1.1

“CCP

Modules

and

Timer

Resources”.

17.2

Capture and Compare Modes

Except for the operation of the Special Event Trigger

discussed below, the Capture and Compare modes of

the ECCP1 module are identical in operation to that of

CCP1. These are discussed in detail in Section 16.2

“Capture Mode” and Section 16.3 “Compare

Mode”.

17.2.1

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 ECCP1

Trigger for ECCP1 can also start an A/D conversion. In

order to start the conversion, the A/D Converter must

be previously enabled.

17.3

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 16.4

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

“Compatible CCP” mode, as in Table 17-1.

TABLE 17-1:

PIN ASSIGNMENTS FOR VARIOUS ECCP MODES

Note:

When setting up single output PWM opera-

tions, users are free to use either of the

processes described in Section 16.4.4

“Setup

for

PWM

Operation”

Section 17.4.9 “Setup for PWM Opera-

tion”. The latter is more generic, but will

work for either single or multi-output PWM.

ECCP Mode

CCP1CON

Configuration

RD4

RD5

RD6

RD7

All PIC18F4480/4580 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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