Enhanced Capture (eCAP) Module
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Table 15-97. ECAP Initialization for CAP Mode Absolute Time, Rising and Falling Edge Trigger
Register Bit Value
ECCTL1 CAP1POL EC_RISING
ECCTL1 CAP2POL EC_FALLING
ECCTL1 CAP3POL EC_RISING
ECCTL1 CAP4POL EC_FALLING
ECCTL1 CTRRST1 EC_ABS_MODE
ECCTL1 CTRRST2 EC_ABS_MODE
ECCTL1 CTRRST3 EC_ABS_MODE
ECCTL1 CTRRST4 EC_ABS_MODE
ECCTL1 CAPLDEN EC_ENABLE
ECCTL1 PRESCALE EC_DIV1
ECCTL2 CAP_APWM EC_CAP_MODE
ECCTL2 CONT_ONESHT EC_CONTINUOUS
ECCTL2 SYNCO_SEL EC_SYNCO_DIS
ECCTL2 SYNCI_EN EC_DISABLE
ECCTL2 TSCTRSTOP EC_RUN
Example 15-10. Code Snippet for CAP Mode Absolute Time, Rising and Falling Edge Trigger
// Code snippet for CAP mode Absolute Time, Rising & Falling edge triggers
// Run Time ( e.g. CEVT4 triggered ISR call)
//==========================================
TSt1 = ECAPxRegs.CAP1; // Fetch Time-Stamp captured at t1
TSt2 = ECAPxRegs.CAP2; // Fetch Time-Stamp captured at t2
TSt3 = ECAPxRegs.CAP3; // Fetch Time-Stamp captured at t3
TSt4 = ECAPxRegs.CAP4; // Fetch Time-Stamp captured at t4
Period1 = TSt3-TSt1; // Calculate 1st period
DutyOnTime1 = TSt2-TSt1; // Calculate On time
DutyOffTime1 = TSt3-TSt2; // Calculate Off time
1622
Pulse-Width Modulation Subsystem (PWMSS) SPRUH73H–October 2011–Revised April 2013
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