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PIC16LC712 Datasheet(PDF) 43 Page - Microchip Technology |
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PIC16LC712 Datasheet(HTML) 43 Page - Microchip Technology |
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43 / 106 page  1999-2013 Microchip Technology Inc. DS41106C-page 43 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 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 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 TABLE 7-4: 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, BOR Value on all other Resets 07h DATACCP — — — — — DCCP — DT1CK xxxx xxxx xxxx xuxu 0Bh,8Bh INTCON GIE PEIE T0IE INTE RBIE T0IF INTF RBIF 0000 000x 0000 000u 0Ch PIR1 — ADIF — — — CCP1IF TMR2IF TMR1IF -0-- -000 -0-- -000 11h TMR2 Timer2 Module’s Register 0000 0000 0000 0000 12h T2CON — TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON T2CKPS1 T2CKPS0 -000 0000 -000 0000 15h CCPR1L Capture/Compare/PWM Register 1 (LSB) xxxx xxxx uuuu uuuu 16h CCPR1H Capture/Compare/PWM Register 1 (MSB) xxxx xxxx uuuu uuuu 17h CCP1CON — — DC1B1 DC1B0 CCP1M3 CCP1M2 CCP1M1 CCP1M0 --00 0000 --00 0000 87h TRISCCP — — — — — TCCP — TT1CK xxxx x1x1 xxxx x1x1 8Ch PIE1 — ADIE — — — CCP1IE TMR2IE TMR1IE -0-- -000 -0-- -000 92h PR2 Timer2 Module’s Period Register 1111 1111 1111 1111 Legend: x = unknown, u = unchanged, — = unimplemented read as ‘0’. Shaded cells are not used by PWM and Timer2. |
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