Datasheet

© 2007 Microchip Technology Inc. DS39629C-page 155
PIC18F6390/6490/8390/8490
14.4.3 SETUP FOR PWM OPERATION
The following steps should be taken when configuring
the CCP2 module for PWM operation:
1. Set the PWM period by writing to the PR2
register.
2. Set the PWM duty cycle by writing to the
CCPR2L register and CCP2CON<5:4> bits.
3. Make the CCP2 pin an output by clearing the
appropriate TRIS bit.
4. Set the TMR2 prescale value, then enable
Timer2 by writing to T2CON.
5. Configure the CCP2 module for PWM operation.
TABLE 14-5: REGISTERS ASSOCIATED WITH PWM AND TIMER2
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reset
Values
on Page
INTCON GIE/GIEH PEIE/GIEL
TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 59
RCON IPEN
SBOREN — RI TO PD POR BOR 60
PIR1 — ADIF RC1IF TX1IF SSPIF CCP1IF TMR2IF TMR1IF 61
PIE1 — ADIE RC1IE TX1IE SSPIE CCP1IE TMR2IE TMR1IE 61
IPR1
— ADIP RC1IP TX1IP SSPIP CCP1IP TMR2IP TMR1IP 61
TRISC PORTC Data Direction Register 62
TRISE PORTE Data Direction Register — — — —62
TMR2 Timer2 Register 60
PR2 Timer2 Period Register 60
T2CON
— T2OUTPS3 T2OUTPS2 T2OUTPS1 T2OUTPS0 TMR2ON T2CKPS1 T2CKPS0 60
CCPR1L Capture/Compare/PWM Register 1 Low Byte 61
CCPR1H Capture/Compare/PWM Register 1 High Byte 61
CCP1CON
— — DC1B1 DC1B0 CCP1M3 CCP1M2 CCP1M1 CCP1M0 61
CCPR2L Capture/Compare/PWM Register 2 Low Byte 61
CCPR2H Capture/Compare/PWM Register 2 High Byte 61
CCP2CON
— — DC2B1 DC2B0 CCP2M3 CCP2M2 CCP2M1 CCP2M0 61
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by PWM or Timer2.