PIC18F258-ESLASHSOSQTP datasheet(133/402 Pages) MICROCHIP

133 / 402 page

DS41159E-page 131

PIC18FXX8

16.0

ENHANCED CAPTURE/

COMPARE/PWM (ECCP)

MODULE

This module contains a 16-bit register which can oper-

ate as a 16-bit Capture register, a 16-bit Compare

The operation of the ECCP module differs from the

CCP (discussed in detail in Section 15.0 “Capture/

Compare/PWM (CCP) Modules”) with the addition of

an Enhanced PWM module which allows for up to 4

output channels and user selectable polarity. These

features are discussed in detail in Section 16.5

“Enhanced PWM Mode”. The module can also be

programmed for automatic shutdown in response to

various analog or digital events.

The

control

for

ECCP1

shown

ECCP1CON: ECCP1 CONTROL REGISTER

Note:

The ECCP (Enhanced Capture/Compare/

PWM)

module

only

available

PIC18F448 and PIC18F458 devices.

R/W-0

EPWM1M1 EPWM1M0

EDC1B1

EDC1B0

ECCP1M3 ECCP1M2 ECCP1M1 ECCP1M0

bit 7

bit 0

bit 7-6

EPWM1M<1:0>: PWM Output Configuration bits

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

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

If ECCP1M<3:2> = 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 deadband control; P1C, P1D assigned as

port pins

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

bit 5-4

EDC1B<1:0>: PWM Duty Cycle Least Significant bits

Capture mode:

Unused.

Compare mode:

Unused.

PWM mode:

These bits are the two LSbs of the PWM duty cycle. The eight MSbs are found in ECCPR1L.

bit 3-0

ECCP1M<3:0>: ECCP1 Mode Select bits

0000

= Capture/Compare/PWM off (resets ECCP module)

0001

= Unused (reserved)

0010

= Compare mode, toggle output on match (ECCP1IF bit is set)

0011

= Unused (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, set output on match (ECCP1IF bit is set)

1001

= Compare mode, clear output on match (ECCP1IF bit is set)

1010

= Compare mode, ECCP1 pin is unaffected (ECCP1IF bit is set)

1011

= Compare mode, trigger special event (ECCP1IF bit is set; ECCP resets TMR1or TMR3

and starts an A/D conversion if the A/D module is enabled)

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

PIC18F258-E/SOSQTP 数据表(PDF) 133 Page - Microchip Technology

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