PIC16F684-ESLASHST datasheet(90/164 Pages) MICROCHIP

90 / 164 page

PIC16F684

DS41202C-page 88

Preliminary

 2004 Microchip Technology Inc.

11.3.9

OPERATION IN SLEEP MODE

In Sleep mode, all clock sources are disabled. Timer2

will not increment, and the state of the module will not

change. If the ECCP pin is driving a value, it will

continue to drive that value. When the device wakes

up, it will continue from this state.

11.3.9.1

OPERATION WITH FAIL-SAFE

CLOCK MONITOR

If the Fail-Safe Clock Monitor is enabled, a clock failure

will force the ECCP to be clocked from the internal

oscillator clock source, which may have a different

clock frequency than the primary clock.

See Section 3.0 “Clock Sources” for additional

details.

11.3.10

EFFECTS OF A RESET

Any Reset will force all ports to Input mode and the

ECCP registers to their Reset states.

This forces the Enhanced CCP module to reset to a

state compatible with the standard CCP module.

11.3.11

SETUP FOR PWM OPERATION

The following steps should be taken when configuring

the ECCP module for PWM operation:

Configure the PWM pins P1A and P1B (and

P1C and P1D, if used) as inputs by setting the

corresponding TRISC bits.

Set the PWM period by loading the PR2 register.

Configure the ECCP module for the desired

PWM mode and configuration by loading the

CCP1CON register with the appropriate values:

• Select one of the available output

configurations and direction with the

P1M<1:0> bits.

• Select the polarities of the PWM output

signals with the CCP1M<3:0> bits.

Set the PWM duty cycle by loading the CCPR1L

For Half-bridge Output mode, set the dead band

delay by loading PWM1CON<6:0> with the

appropriate value.

If auto-shutdown operation is required, load the

ECCPAS register:

• Select the auto-shutdown sources using the

ECCPAS<2:0> bits.

• Select the shutdown states of the PWM

output pins using PSSAC<1:0> and

PSSBD<1:0> bits.

• Set the ECCPASE bit (ECCPAS<7>).

• Configure the comparators using the

CMCON0 register (Register 8-1).

• Configure the comparator inputs as analog

inputs.

If auto-restart operation is required, set the

PRSEN bit (PWM1CON<7>).

Configure and start TMR2:

• Clear the TMR2 interrupt flag bit by clearing

the TMR2IF bit (PIR1<1>).

• Set the TMR2 prescale value by loading the

T2CKPS bits (T2CON<1:0>).

• Enable Timer2 by setting the TMR2ON bit

(T2CON<2>).

Enable PWM outputs after a new PWM cycle

has started:

• Wait until TMR2 overflows (TMR2IF bit is set).

• Enable the CCP1/P1A, P1B, P1C and/or P1D

pin outputs by clearing the respective TRISC

bits.

• Clear the ECCPASE bit (ECCPAS<7>).

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