31.3.3 DMT Count Windowed Interval

The DMT module has a Windowed Operation mode. The PSINTV register will set the window interval value. In Windowed mode, software can clear the DMT only when the counter is in its final window before a count match occurs. That is, if the DMT counter value (DMTCNT) is greater than or equal to the value written to the window interval value (PSINTV), then only the clear sequence can be inserted into the DMT module.

The “window interval” is open when: (COUNTER) ≥ PSINTV. If the DMT is cleared before the allowed window, a Deadman Timer soft trap is immediately generated.

Note: Care should be exercised when selecting the “window interval”, such that the interval does not begin after the time-out instruction count specified by PSCNT[31:0].