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PIC12F683 Datasheet(PDF) 72 Page - Microchip Technology |
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PIC12F683 Datasheet(HTML) 72 Page - Microchip Technology |
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72 / 148 page  PIC12F683 DS41211B-page 70 Preliminary 2004 Microchip Technology Inc. 11.1 Capture Mode In Capture mode, CCPR1H:CCPR1L captures the 16-bit value of the TMR1 register when an event occurs on pin GP2/AN2/T0CKI/INT/COUT/CCP1. An event is defined as one of the following and is configured by CCP1CON<3:0>: • Every falling edge • Every rising edge • Every 4th rising edge • Every 16th rising edge When a capture is made, the interrupt request flag bit, CCP1IF (PIR1<5>), is set. The interrupt flag must be cleared in software. If another capture occurs before the value in register CCPR1 is read, the old captured value is overwritten by the new captured value. 11.1.1 CCP1 PIN CONFIGURATION In Capture mode, the GP2/AN2/T0CKI/INT/COUT/ CCP1 pin should be configured as an input by setting the TRISIO<2> bit. FIGURE 11-1: CAPTURE MODE OPERATION BLOCK DIAGRAM 11.1.2 TIMER1 MODE SELECTION Timer1 must be running in Timer mode or Synchro- nized Counter mode for the CCP module to use the capture feature. In Asynchronous Counter mode, the capture operation may not work. 11.1.3 SOFTWARE INTERRUPT When the Capture mode is changed, a false capture interrupt may be generated. The user should keep bit CCP1IE (PIE1<5>) clear to avoid false interrupts and should clear the flag bit CCP1IF following any such change in operating mode. 11.1.4 CCP PRESCALER There are four prescaler settings specified by bits CCP1M<3:0> (CCP1CON<3:0>). Whenever the CCP module is turned off, or the CCP module is not in Cap- ture mode, the prescaler counter is cleared. Any Reset will clear the prescaler counter. Switching from one capture prescaler to another may generate an interrupt. Also, the prescaler counter will not be cleared; therefore, the first capture may be from a non-zero prescaler. Example 11-1 shows the recom- mended method for switching between capture prescalers. This example also clears the prescaler counter and will not generate the “false” interrupt. EXAMPLE 11-1: CHANGING BETWEEN CAPTURE PRESCALERS Note: If the GP2/AN2/T0CKI/INT/COUT/CCP1 pin is configured as an output, a write to the port can cause a capture condition. CCPR1H CCPR1L TMR1H TMR1L Set Flag bit CCP1IF (PIR1<5>) Capture Enable Q’s CCP1CON<3:0> GP2/CCP1 Prescaler ÷ 1, 4, 16 and Edge Detect pin CLRF CCP1CON ;Turn CCP module off MOVLW NEW_CAPT_PS ;Load the W reg with ;the new prescaler ;move value and CCP ON MOVWF CCP1CON ;Load CCP1CON with this ;value |
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