PIC16F877ATISLASHML datasheet(70/234 Pages) MICROCHIP

70 / 234 page

PIC16F87XA

DS39582B-page 68

 2003 Microchip Technology Inc.

8.3.3

SETUP FOR PWM OPERATION

The following steps should be taken when configuring

the CCP module for PWM operation:

Set the PWM period by writing to the PR2 register.

Set the PWM duty cycle by writing to the

CCPR1L register and CCP1CON<5:4> bits.

Make the CCP1 pin an output by clearing the

TRISC<2> bit.

Set the TMR2 prescale value and enable Timer2

by writing to T2CON.

Configure the CCP1 module for PWM operation.

TABLE 8-3:

EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 20 MHz

TABLE 8-4:

REGISTERS ASSOCIATED WITH CAPTURE, COMPARE AND TIMER1

PWM Frequency

1.22 kHz

4.88 kHz

19.53 kHz

78.12kHz

156.3 kHz

208.3 kHz

Timer Prescaler (1, 4, 16)

PR2 Value

0xFFh

0x3Fh

0x1Fh

0x17h

Maximum Resolution (bits)

5.5

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on:

POR, BOR

Value on

all other

Resets

0Bh,8Bh,

10Bh, 18Bh

INTCON

GIE

PEIE

TMR0IE

INTE

RBIE

TMR0IF

INTF

RBIF

0000 000x 0000 000u

0Ch

PIR1

PSPIF(1)

ADIF

RCIF

TXIF

SSPIF

CCP1IF

TMR2IF

TMR1IF 0000 0000 0000 0000

0Dh

PIR2

—

—CCP2IF ---- ---0 ---- ---0

8Ch

PIE1

PSPIE(1)

ADIE

RCIE

TXIE

SSPIE

CCP1IE

TMR2IE

TMR1IE 0000 0000 0000 0000

8Dh

PIE2

—

CCP2IE ---- ---0 ---- ---0

87h

TRISC

PORTC Data Direction Register

1111 1111 1111 1111

0Eh

TMR1L

Holding Register for the Least Significant Byte of the 16-bit TMR1 Register

xxxx xxxx uuuu uuuu

0Fh

TMR1H

Holding Register for the Most Significant Byte of the 16-bit TMR1 Register

xxxx xxxx uuuu uuuu

10h

T1CON

—

T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON --00 0000 --uu uuuu

15h

CCPR1L

Capture/Compare/PWM Register 1 (LSB)

xxxx xxxx uuuu uuuu

16h

CCPR1H

Capture/Compare/PWM Register 1 (MSB)

xxxx xxxx uuuu uuuu

17h

CCP1CON

—

CCP1X

CCP1Y

CCP1M3 CCP1M2 CCP1M1 CCP1M0 --00 0000 --00 0000

1Bh

CCPR2L

Capture/Compare/PWM Register 2 (LSB)

xxxx xxxx uuuu uuuu

1Ch

CCPR2H

Capture/Compare/PWM Register 2 (MSB)

xxxx xxxx uuuu uuuu

1Dh

CCP2CON

—

CCP2X

CCP2Y

CCP2M3 CCP2M2 CCP2M1 CCP2M0 --00 0000 --00 0000

Legend:

= unknown, u = unchanged, - = unimplemented, read as ‘0’. Shaded cells are not used by Capture and Timer1.

Note

The PSP is not implemented on 28-pin devices; always maintain these bits clear.

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