PIC18F4410T-I/ML【PDF 44/234 页】IC MCU FLASH 8KX16 44QFN

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Sheet目录3878

40页 41页 42页 43页 [44页]45页 46页 47页 48页

PIC18F2X1X/4X1X

DS39636D-page 140

2009 Microchip Technology Inc.

In addition to the expanded range of modes available

through the CCP1CON and ECCP1AS registers, the

ECCP module has an additional register associated

with Enhanced PWM operation and auto-shutdown

features. This register is:

PWM1CON (PWM Configuration register)

15.1

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 15-1.

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

PWM mode must be selected by 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.

15.1.1

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 14.1.1

“CCP

Modules

and

Timer

Resources”.

15.2

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 14.2

“Capture Mode” and Section 14.3 “Compare

Mode”. No changes are required when moving

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

15.2.1

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

15.3

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 14.4

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

“Compatible CCP” mode, as in Table 15-1.

TABLE 15-1:

PIN ASSIGNMENTS FOR VARIOUS ECCP1 MODES

Note:

When setting up single output PWM

operations, users are free to use either of

the processes described in Section 14.4.4

“Setup

for

PWM

Operation”

Section 15.4.9 “Setup for PWM Opera-

tion”. 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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