ATMEL_TC_ETRGEDG_RISING
cmr |= ATMEL_TC_ETRGEDG_RISING | ATMEL_TC_ABETRG | ATMEL_TC_XC0;
case ATMEL_TC_ETRGEDG_RISING:
ATMEL_TC_ETRGEDG_RISING | ATMEL_TC_LDBDIS | \
edge = ATMEL_TC_ETRGEDG_RISING;