PIC18F87J90 Datasheet, PDF (181/450 Pages) Microchip Technology – 64/80-Pin, High-Performance Microcontrollers with LCD Driver and nanoWatt Technology

PIC18F87J90 FAMILY
16.4.3 SETUP FOR PWM OPERATION
The following steps should be taken when configuring
the CCP 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 16-5: 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
—
CM
RI
TO
PD
POR
BOR
60
PIR1
—
ADIF
RC1IF
TX1IF
SSPIF
—
TMR2IF TMR1IF 62
PIE1
—
ADIE
RC1IE
TX1IE
SSPIE
—
TMR2IE TMR1IE 62
IPR1
—
ADIP
RC1IP
TX1IP
SSPIP
—
TMR2IP TMR1IP 62
TRISC
TRISC7 TRISC6 TRISC5 TRISC4 TRISC3 TRISC2 TRISC1 TRISC0 62
TRISE
TRISE7 TRISE6 TRISE5 TRISE4 TRISE3
—
TRISE1 TRISE0 62
TRISG
SPIOD CCP2OD CCP1OD TRISG4 TRISG3 TRISG2 TRISG1 TRISG0 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
63
CCPR1H Capture/Compare/PWM Register 1 High Byte
63
CCP1CON —
—
DC1B1 DC1B0 CCP1M3 CCP1M2 CCP1M1 CCP1M0 63
CCPR2L Capture/Compare/PWM Register 2 Low Byte
64
CCPR2H Capture/Compare/PWM Register 2 High Byte
63
CCP2CON —
—
DC2B1 DC2B0 CCP2M3 CCP2M2 CCP2M1 CCP2M0 64
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by PWM or Timer2.
 2010 Microchip Technology Inc.
DS39933D-page 181