PIC16LC771 datasheet(53/224 Pages) MICROCHIP

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DS41120C-page 53

PIC16C717/770/771

8.0

ENHANCED CAPTURE/

COMPARE/PWM (ECCP)

MODULES

The

ECCP

(Enhanced

Capture/Compare/PWM)

module contains a 16-bit register which can operate as

a 16-bit capture register, as a 16-bit compare register

or as a PWM master/slave Duty Cycle register.

Table 8-1 shows the timer resources of the ECCP mod-

ule modes.

Capture/Compare/PWM Register1 (CCPR1) is com-

prised of two 8-bit registers: CCPR1L (low byte) and

CCPR1H (high byte). The CCP1CON and P1DEL reg-

isters control the operation of ECCP. All are readable

and writable.

CCP1 CONTROL REGISTER (CCP1CON: 17h)

R/W-0

PWM1M1 PWM1M0

DC1B1

DC1B0

CCP1M3

CCP1M2

CCP1M1

CCP1M0

bit 7

bit 0

bit 7-6

PWM1M<1:0>: PWM Output Configuration

CCP1M<3:2> = 00, 01, 10

= P1A assigned as Capture input, Compare output. P1B, P1C, P1D assigned as Port pins.

CCP1M<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

DC1B<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

CCPRnL.

bit 3-0

CCP1M<3:0>: ECCP Mode Select bits

0000

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

0001

= Unused (reserved)

0010

= Compare mode, toggle output on match (CCP1IF 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 (CCP1IF bit is set)

1001

= Compare mode, clear output on match (CCP1IF bit is set)

1010

= Compare mode, generate software interrupt on match (CCP1IF bit is set, CCP1 pin is

unaffected)

1011

= Compare mode, trigger special event (CCP1IF bit is set; ECCP resets TMR1, 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

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