PIC18F4580-ESLASHML datasheet(177/490 Pages) MICROCHIP

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DS39637D-page 177

PIC18F2480/2580/4480/4580

17.0 ENHANCED

CAPTURE/COMPARE/PWM

(ECCP) MODULE

In PIC18F4480/4580 devices, ECCP1 is implemented

as a standard CCP module with Enhanced PWM

capabilities. These include the provision for 2 or

4 output channels, user-selectable polarity, dead-band

control and automatic shutdown and restart. The

Enhanced features are discussed in detail in

Section 17.4 “Enhanced PWM Mode”. Capture,

Compare and single-output PWM functions of the

ECCP module are the same as described for the

standard CCP module.

The control register for the Enhanced CCP module is

shown in Register 17-1. It differs from the CCP1CON

Most Significant bits are implemented to control PWM

functionality.

Note:

The ECCP1 module is implemented only

in PIC18F4X80 (40/44-pin) devices.

ECCP1CON REGISTER (ECCP1 MODULE, PIC18F4480/4580 DEVICES)

R/W-0

EPWM1M1

EPWM1M0

EDC1B1

EDC1B0

ECCP1M3

ECCP1M2

ECCP1M1

ECCP1M0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-6

EPWM1M<1:0>: Enhanced PWM Output Configuration bits

If ECCP1M<3:2> = 00, 01, 10:

xx = P1A assigned as Capture/Compare input/output; P1B, P1C, P1D assigned as port pins

If ECCP1M<3:2> = 11:

00 = Single output: P1A modulated; P1B, P1C, P1D assigned as port pins

01 = Full-bridge output forward: P1D modulated; P1A active; P1B, P1C inactive

10 = Half-bridge output: P1A, P1B modulated with dead-band control; P1C, P1D assigned as port pins

11 = Full-bridge output reverse: P1B modulated; P1C active; P1A, P1D inactive

bit 5-4

EDC1B<1:0>: ECCP1 Module PWM Duty Cycle bit 1 and bit 0

Capture mode:

Unused.

Compare mode:

Unused.

PWM mode:

These bits are the two LSbs of the 10-bit PWM duty cycle. The eight MSbs of the duty cycle are found

in ECCPR1L.

bit 3-0

ECCP1M<3:0>: Enhanced CCP1 Mode Select bits

0000 = Capture/Compare/PWM off (resets ECCP1 module)

0001 = Reserved

0010 = Compare mode; toggle output on match

0011 = Reserved

0100 = Capture mode; every falling edge

0101 = Capture mode; every rising edge

0110 = Capture mode; every 4th rising edge

0111 = Capture mode; every 16th rising edge

1000 = Compare mode; initialize ECCP1 pin low; set output on compare match (set ECCP1IF)

1001 = Compare mode; initialize ECCP1 pin high; clear output on compare match (set ECCP1IF)

1010 = Compare mode; generate software interrupt only; ECCP1 pin reverts to I/O state

1011 = Compare mode; trigger special event (ECCP1 resets TMR1 or TMR3, sets ECCP1IF bit and

starts the A/D conversion on ECCP1 match)

1100 = PWM mode; P1A, P1C active-high; P1B, P1D active-high

1101 = PWM mode; P1A, P1C active-high; P1B, P1D active-low

1110 = PWM mode; P1A, P1C active-low; P1B, P1D active-high

1111 = PWM mode; P1A, P1C active-low; P1B, P1D active-low

PIC18F4580-E/ML Datasheet(PDF) 177 Page - Microchip Technology

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