PIC18F2680ISPSQTP datasheet(175/482 Pages) MICROCHIP

175 / 482 page

Preliminary

DS39625C-page 173

PIC18F2585/2680/4585/4680

16.0

ENHANCED

CAPTURE/COMPARE/PWM

(ECCP1) MODULE

In PIC18F4585/4680 devices, ECCP1 is implemented

as a standard CCP1 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

detail

Section 16.4 “Enhanced PWM Mode”. Capture,

Compare and single output PWM functions of the

ECCP1 module are the same as described for the

standard CCP1 module.

The control register for the Enhanced CCP1 module is

shown in Register 16-1. It differs from the CCP1CON

two Most Significant bits are implemented to control

PWM functionality.

ECCP1CON REGISTER (ECCP1 MODULE, PIC18F4585/4680 DEVICES)

Note:

The ECCP1 module is implemented only

in PIC18F4X8X (40/44-pin) devices.

R/W-0

EPWM1M1 EPWM1M0 EDC1B1

EDC1B0 ECCP1M3 ECCP1M2 ECCP1M1 ECCP1M0

bit 7

bit 0

bit 7-6

EPWM1M1:EPWM1M0: Enhanced PWM Output Configuration bits

If ECCP1M3:ECCP1M2 = 00, 01, 10:

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

If ECCP1M3:ECCP1M2 = 11:

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

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

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

as port pins

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

bit 5-4

EDC1B1:EDC1B0: 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 CCPR1L/ECCPR1L.

bit 3-0

ECCP1M3:ECCP1M0: 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

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

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