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Angle Functions

23.3.1.2 APCNT Underflow

The fastest valid external signal APCNT can accept must satisfy the following condition:

Step Width K < Period Min. Resolution (LRP)

This condition fixes the maximum possible step width once the minimum period and the resolution of an

application are specified.

If a period value accidentally falls below the minimum allowed, APCNT stops the capture of these periods

and sets the APCNT underflow interrupt flag located in the exceptions interrupt control register. In such a

situation, SCNT and ACNT continue to be executed using the last valid period captured by APCNT.

23.3.1.3 APCNT Overflow

The slowest valid external signal APCNT can measure must satisfy the following condition:

Period Max Resolution < 33554431

When this limit is reached (APCNT Count equals all 1 ’s), APCNT stays at a maximum count (stops

counting). APCNT remains in this position until the next specified capture edge is detected on the selected

pin and sets the APCNT overflow interrupt flag located in the exceptions interrupt control register. In this

situation, SCNT and ACNT continue to be executed using the maximum APCNT period count.

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SPNU562–May 2014 High-End Timer (N2HET) Module

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