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PIC18F258-E/SOSQTP 数据表(PDF) 131 Page - Microchip Technology |
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PIC18F258-E/SOSQTP 数据表(HTML) 131 Page - Microchip Technology |
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131 / 402 page  © 2006 Microchip Technology Inc. DS41159E-page 129 PIC18FXX8 The maximum PWM resolution (bits) for a given PWM frequency is given by the following equation. EQUATION 15-3: 15.4.3 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 15-4: EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 40 MHz TABLE 15-5: REGISTERS ASSOCIATED WITH PWM AND TIMER2 Note: If the PWM duty cycle value is longer than the PWM period, the CCP1 pin will not be cleared. FOSC FPWM --------------- ⎝⎠ ⎛⎞ log 2 () log -----------------------------bits = PWM Resolution (max) PWM Frequency 2.44 kHz 9.76 kHz 39.06 kHz 156.3 kHz 312.5 kHz 416.6 kHz Timer Prescaler (1, 4, 16) 16 4 1 1 1 1 PR2 Value 0FFh 0FFh 0FFh 3Fh 1Fh 17h Maximum Resolution (bits) 10 10 10 8 7 5.5 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 INTCON GIE/ GIEH PEIE/ GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 0000 000x 0000 000u PIR1 PSPIF(1) ADIF RCIF TXIF SSPIF CCP1IF TMR2IF TMR1IF 0000 0000 0000 0000 PIE1 PSPIE(1) ADIE RCIE TXIE SSPIE CCP1IE TMR2IE TMR1IE 0000 0000 0000 0000 IPR1 PSPIP(1) ADIP RCIP TXIP SSPIP CCP1IP TMR2IP TMR1IP 1111 1111 1111 1111 TRISD PORTD Data Direction Register 1111 1111 1111 1111 TMR2 Timer2 Module Register 0000 0000 0000 0000 PR2 Timer2 Module Period Register 1111 1111 1111 1111 T2CON — TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON T2CKPS1 T2CKPS0 -000 0000 -000 0000 CCPR1L Capture/Compare/PWM Register1 (LSB) xxxx xxxx uuuu uuuu CCPR1H Capture/Compare/PWM Register1 (MSB) xxxx xxxx uuuu uuuu CCP1CON — — DC1B1 DC1B0 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. Note 1: These registers or register bits are not implemented on the PIC18F248 and PIC18F258 and read as ‘0’s. |
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