PIC16F76T-I/SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F76T-I/SP

28/40-pin, 8-bit CMOS FLASH Microcontrollers

Microchip Technology 

PIC16F7X

8.5.3 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

CCPR1L register and CCP1CON<5:4> bits.

3. Make the CCP1 pin an output by clearing the

TRISC<2> bit.

4. Set the TMR2 prescale value and enable Timer2

by writing to T2CON.

5. Configure the CCP1 module for PWM operation.

TABLE 8-4: EXAMPLE PWM FREQUENCIES AND RESOLUTIONS (FOSC = 20 MHz)

PWM Frequency

Timer Prescale (1, 4, 16)

PR2 Value

Maximum Resolution (bits)

1.22 kHz

16

0xFF

10

4.88 kHz

4

0xFF

10

19.53 kHz

1

0xFF

10

78.12 kHz

1

0x3F

8

156.3 kHz

1

0x1F

7

208.3 kHz

1

0x17

5.5

TABLE 8-5: REGISTERS ASSOCIATED WITH PWM AND TIMER2

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, INTCON

10Bh,18Bh

0Ch

PIR1

GIE

PSPIF(1)

PEIE

ADIF

TMR0IE

RCIF

INTE

TXIF

RBIE TMR0IF INTF RBIF 0000 000x 0000 000u

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

11h

TMR2 Timer2 Module Register

0000 0000 0000 0000

92h

PR2

Timer2 Module Period Register

1111 1111 1111 1111

12h

T2CON

— TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON T2CKPS1 T2CKPS0 -000 0000 -000 0000

15h

CCPR1L Capture/Compare/PWM Register1 (LSB)

xxxx xxxx uuuu uuuu

16h

CCPR1H Capture/Compare/PWM Register1 (MSB)

xxxx xxxx uuuu uuuu

17h

CCP1CON —

—

CCP1X CCP1Y CCP1M3 CCP1M2 CCP1M1 CCP1M0 --00 0000 --00 0000

1Bh

CCPR2L Capture/Compare/PWM Register2 (LSB)

xxxx xxxx uuuu uuuu

1Ch

CCPR2H Capture/Compare/PWM Register2 (MSB)

xxxx xxxx uuuu uuuu

1Dh

CCP2CON —

—

CCP2X CCP2Y CCP2M3 CCP2M2 CCP2M1 CCP2M0 --00 0000 --00 0000

Legend: x = unknown, u = unchanged, - = unimplemented, read as '0'. Shaded cells are not used by PWM and Timer2.

Note 1: Bits PSPIE and PSPIF are reserved on the PIC16F73/76; always maintain these bits clear.

DS30325B-page 58

 2002 Microchip Technology Inc.

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