PIC16LC62B-04I/SO 查看數據表（PDF） - Microchip Technology

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PIC16LC62B-04I/SO

28-Pin 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC16C62B/72A

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 on-time 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 7-4 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 7-5 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

GIE

PEIE

T0IE

INTE

RBIE

T0IF

INTF

RBIF 0000 000x 0000 000u

0Ch

PIR1

8Ch

PIE1

—

ADIF

—

—

ADIE

—

—

SSPIF CCP1IF TMR2IF TMR1IF -0-- 0000 -0-- 0000

—

SSPIE CCP1IE TMR2IE TMR1IE -0-- 0000 -0-- 0000

87h

TRISC

PORTC Data Direction Register

11h

TMR2

Timer2 module’s register

1111 1111 1111 1111

0000 0000 0000 0000

92h

PR2

Timer2 module’s 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

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

© 1999 Microchip Technology Inc.

Preliminary

DS35008B-page 37

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