PIC18F23K20-E/MLQTP MICROCHIP [Microchip Technology], PIC18F23K20-E/MLQTP Datasheet - Page 164

• Manufacturer Part Number: PIC18F23K20-E/MLQTP
• Description: 28/40/44-Pin Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F2XK20/4XK20
15.4.4
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.
In PRI_IDLE mode, the primary clock will continue to
clock the CCP module without change. In all other
power-managed modes, the selected power-managed
mode clock will clock Timer2. Other power-managed
mode clocks will most likely be different than the
primary clock frequency.
15.4.5
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 2.0 “Oscillator Module (With Fail-Safe
Clock Monitor)” for additional details.
15.4.6
Any Reset will force all ports to Input mode and the
CCP registers to their Reset states.
DS41303B-page 162
OPERATION IN POWER-MANAGED
MODES
CHANGES IN SYSTEM CLOCK
FREQUENCY
EFFECTS OF RESET
Advance Information
15.4.7
The following steps should be taken when configuring
the CCP module for PWM operation:
1.
2.
3.
4.
5.
6.
7.
Disable the PWM pin (CCPx) output drivers by
setting the associated TRIS bit.
For the ECCP module only: Select the desired
PWM outputs (P1A through P1D) by setting the
appropriate steering bits of the PSTRCON
register.
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 CCPx bits of the CCPxCON register.
Configure and start Timer2:
Enable PWM output after a new PWM cycle has
started:
• Clear the TMR2IF interrupt flag bit of the
• Set the Timer2 prescale value by loading the
• Enable Timer2 by setting the TMR2ON bit of
• Wait until Timer2 overflows (TMR2IF bit of
• Enable the CCPx pin output driver by
PIR1 register.
T2CKPS bits of the T2CON register.
the T2CON register.
the PIR1 register is set).
clearing the associated TRIS bit.
SETUP FOR PWM OPERATION
© 2007 Microchip Technology Inc.