PIC18F2680ISPSQTP datasheet(176/482 Pages) MICROCHIP

176 / 482 page

PIC18F2585/2680/4585/4680

DS39625C-page 174

Preliminary

In addition to the expanded range of modes available

through the CCP1CON register, the ECCP1 module

has two additional registers associated with Enhanced

PWM operation and auto-shutdown features. They are:

• ECCP1DEL (Dead-band delay)

• ECCP1AS (Auto-shutdown configuration)

16.1

ECCP1 Outputs and Configuration

The Enhanced CCP1 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 CCP1

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

EPWM1M1:EPWM1M0 and CCP1M3:CCP1M0 bits.

The appropriate TRISC and TRISD direction bits for the

port pins must also be set as outputs.

16.1.1

ECCP1 MODULES AND TIMER

RESOURCES

Like the standard CCP1 modules, the ECCP1 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 CCP1 modules

are identical to those described for standard CCP1

modules. Additional details on timer resources are

provided in Section 15.1.1 “CCP1 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 ECCP1 module are identical in operation to that of

CCP1. These are discussed in detail in Section 15.2

“Capture Mode” and Section 15.3 “Compare Mode”.

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 ECCP1

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

start the conversion, the A/D converter must be

previously enabled.

16.3

Standard PWM Mode

When configured in Single Output mode, the ECCP1

module functions identically to the standard CCP1

module in PWM mode, as described in Section 15.4

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

“Compatible CCP1” mode, as in Table 16-1.

TABLE 16-1:

PIN ASSIGNMENTS FOR VARIOUS ECCP1 MODES

Note: When

setting

single

output

PWM

operations, users are free to use either of the

processes

described

Section 15.4.4

“Setup

for

PWM

Operation”

Section 16.4.9 “Setup for PWM Operation”.

The latter is more generic but will work for

either single or multi-output PWM.

ECCP1 Mode

CCP1CON

Configuration

RD4

RD5

RD6

RD7

All PIC18F4585/4680 devices:

Compatible CCP1

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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