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PIC16F628-20/SS bảng dữ liệu(PDF) 67 Page - Microchip Technology |
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PIC16F628-20/SS bảng dữ liệu(HTML) 67 Page - Microchip Technology |
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67 / 160 page  PIC16F62X © 1999 Microchip Technology Inc. Preliminary DS40300B-page 67 10.3.3 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 TRISB<3> bit. 4. Set the TMR2 prescale value and enable Timer2 by writing to T2CON. 5. Configure the CCP1 module for PWM operation. TABLE 10-3 EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 20 MHz TABLE 10-4 REGISTERS ASSOCIATED WITH PWM AND TIMER2 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) 16 4 1 1 1 1 PR2 Value 0xFF 0xFF 0xFF 0x3F 0x1F 0x17 Maximum Resolution (bits) 10 10 10 8 7 5.5 Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on POR Value on all other resets 0Bh/8Bh/ 10Bh/18Bh INTCON GIE PEIE T0IE INTE RBIE T0IF INTF RBIF 0000 000x 0000 000u 0Ch PIR1 EEIF CMIF RCIF TXIF — CCP1IF TMR2IF TMR1IF 0000 -000 0000 -000 8Ch PIE1 EEIE CMIE RCIE TXIE — CCP1IE TMR2IE TMR1IE 0000 -000 0000 -000 87h TRISB PORTB Data Direction Register 1111 1111 1111 1111 11h TMR2 Timer2 module’s register 0000 0000 0000 0000 92h PR2 Timer2 module’s period register 1111 1111 1111 1111 12h T2CON — TOUTPS 3 TOUTPS 2 TOUTPS 1 TOUTPS 0 TMR2ON T2CKPS 1 T2CKPS 0 -000 0000 uuuu uuuu 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. |
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