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PIC18LF4331 Datasheet(PDF) 160 Page - Microchip Technology |
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PIC18LF4331 Datasheet(HTML) 160 Page - Microchip Technology |
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160 / 392 page  PIC18F2331/2431/4331/4431 DS39616D-page 160 2010 Microchip Technology Inc. 17.1.8 SPECIAL EVENT TRIGGER (CAP1 ONLY) The Special Event Trigger mode of IC1 (CAP1M<3:0> = 1110 or 1111) enables the Special Event Trigger signal. The trigger signal can be used as the Special Event Trigger Reset input to TMR5, resetting the timer when the specific event happens on IC1. The events are summarized in Table 17-2. TABLE 17-2: SPECIAL EVENT TRIGGER 17.1.9 OPERATING MODES SUMMARY Table 17-3 shows a summary of the input capture configuration when used in conjunction with the TMR5 timer resource. 17.1.10 OTHER OPERATING MODES Although the IC and QEI submodules are mutually exclusive, the IC can be reconfigured to work with the QEI module to perform specific functions. In effect, the QEI “borrows” hardware from the IC to perform these operations. For velocity measurement, the QEI uses dedicated hardware in channel IC1. The CAP1BUF registers are remapped, becoming the VELR registers. Its operation and use are described in Section 17.2.6 “Velocity Measurement” . While in QEI mode, the CAP2BUF and CAP3BUF reg- isters of channel IC2 and IC3 are used for position determination. They are remapped as the POSCNT and MAXCNT Buffer registers, respectively. TABLE 17-3: INPUT CAPTURE TIME BASE RESET SUMMARY CAP1M<3:0> Description 1110 The trigger occurs on every falling edge on the CAP1 input. 1111 The trigger occurs on every rising edge on the CAP1 input. Pin CAPxM Mode Timer Reset Timer on Capture Description CAP1 0001-0100 Edge Capture TMR5 optional(1) Simple Edge Capture mode (includes a selectable prescaler). 0101 Period Measurement TMR5 optional(1) Captures Timer5 on period boundaries. 0110-0111 Pulse-Width Measurement TMR5 always Captures Timer5 on pulse boundaries. 1000 Input Capture on State Change TMR5 optional(1) Captures Timer5 on state change. 1110-1111 Special Event Trigger (rising or falling edge) TMR5 optional(2) Used as a Special Event Trigger to be used with the Timer5 or other peripheral modules. CAP2 0001-0100 Edge Capture TMR5 optional(1) Simple Edge Capture mode (includes a selectable prescaler). 0101 Period Measurement TMR5 optional(1) Captures Timer5 on period boundaries. 0110-0111 Pulse-Width Measurement TMR5 always Captures Timer5 on pulse boundaries. 1000 Input Capture on State Change TMR5 optional(1) Captures Timer5 on state change. CAP3 0001-0100 Edge Capture TMR5 optional(1) Simple Edge Capture mode (includes a selectable prescaler). 0101 Period Measurement TMR5 optional(1) Captures Timer5 on period boundaries. 0110-0111 Pulse-Width Measurement TMR5 always Captures Timer5 on pulse boundaries. 1000 Input Capture on State Change TMR5 optional(1) Captures Timer5 on state change. Note 1: Timer5 may be reset on capture events only when CAPxREN = 1. 2: Trigger mode will not reset Timer5 unless RESEN = 0 in the T5CON register. |
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