PIC16F883 Microchip Technology Inc., PIC16F883 Datasheet - Page 133

• Manufacturer Part Number: PIC16F883
• Description: 28/40/44-pin Flash-based, 8-bit Cmos Microcontrollers With Nanowatt Technology
• Manufacturer: Microchip Technology Inc.

11.5.4
In Sleep mode, the TMR2 register will not increment
and the state of the module will not change. If the CCPx
pin is driving a value, it will continue to drive that value.
When the device wakes up, TMR2 will continue from its
previous state.
11.5.5
The PWM frequency is derived from the system clock
frequency. Any changes in the system clock frequency
will result in changes to the PWM frequency. See
Section 4.0 “Oscillator Module (With Fail-Safe
Clock Monitor)” for additional details.
11.5.6
Any Reset will force all ports to Input mode and the
CCP registers to their Reset states.
© 2007 Microchip Technology Inc.
OPERATION IN SLEEP MODE
CHANGES IN SYSTEM CLOCK
FREQUENCY
EFFECTS OF RESET
PIC16F882/883/884/886/887
Preliminary
11.5.7
The following steps should be taken when configuring
the CCP module for PWM operation:
1.
2.
3.
4.
5.
6.
Disable the PWM pin (CCPx) output drivers as
an input by setting the associated TRIS bit.
Set the PWM period by loading the PR2 register.
Configure the CCP module for the PWM mode
by loading the CCPxCON register with the
appropriate values.
Set the PWM duty cycle by loading the CCPRxL
register and DCxB<1:0> bits of the CCPxCON
register.
Configure and start Timer2:
• Clear the TMR2IF interrupt flag bit of the
• Set the Timer2 prescale value by loading the
• Enable Timer2 by setting the TMR2ON bit of
Enable PWM output after a new PWM cycle has
started:
• Wait until Timer2 overflows (TMR2IF bit of
• Enable the CCPx pin output driver by clearing
PIR1 register.
T2CKPS bits of the T2CON register.
the T2CON register.
the PIR1 register is set).
the associated TRIS bit.
SETUP FOR PWM OPERATION
DS41291D-page 131