PIC16C712T-04/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C712T-04/SO

8-Bit CMOS Microcontrollers with A/D Converter and Capture/Compare/PWM

Microchip Technology 

PIC16C712/716

7.3.3 SET-UP 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 regis-

ter.

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

TRISCCP<2> bit.

4. Set the TMR2 prescale value and enable Timer2

by writing to T2CON.

5. Configure the CCP1 module for PWM operation.

TABLE 7-3 EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 20 MHz

PWM Frequency

1.22 kHz 4.88 kHz 19.53 kHz 78.12 kHz 156.3 kHz 208.3 kHz

Timer Prescaler (1, 4, 16)

PR2 Value

Maximum Resolution (bits)

16

0xFF

10

4

0xFF

10

1

0xFF

10

1

0x3F

8

1

0x1F

7

1

0x17

5.5

TABLE 7-4 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

07h

0Bh,8Bh

0Ch

11h

DATACCP

—

—

—

INTCON

GIE

PEIE

T0IE

PIR1

—

ADIF

—

TMR2

Timer2 module’s register

—

INTE

—

—

RBIE

—

DCCP

T0IF

CCP1IF

—

INTF

TMR2IF

DT1CK xxxx xxxx xxxx xuxu

RBIF 0000 000x 0000 000u

TMR1IF -0-- -000 -0-- -000

0000 0000 0000 0000

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 —

87h

TRISCCP

—

—

DC1B1 DC1B0 CCP1M3 CCP1M2 CCP1M1 CCP1M0 --00 0000 --00 0000

—

—

—

—

TCCP

—

TT1CK xxxx x1x1 xxxx x1x1

8Ch

PIE1

—

ADIE

—

—

92h

PR2

Timer2 module’s period register

— CCP1IE TMR2IE TMR1IE -0-- -000 -0-- -000

1111 1111 1111 1111

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

© 1999 Microchip Technology Inc.

Preliminary

DS41106A-page 43

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