SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
The individual 32-bit counters in the SCTM can be chained with an adjacent counter to form a 64-bit counter. Counters can be chained to a counter across an even-odd index boundary with the even counter containing the least-significant 32-bits of the 64-bit pairing. For example, when counters 1 and 0 are paired, counter 1 contains bits 63:32 and counter 0 contains bits 31:00. The higher-order counter increments by 1 each time the lower order counter wraps.
Counters are chained by setting the CHAIN bit in the SCTM_CTCR_WT_j or SCTM_CTCR_WOT_j register for both of the counters. When chained, the counter control for both counters is taken from the lower-order SCTM_CTCR_WT_j or SCTM_CTCR_WOT_j register. Other than CHAIN, all the other bits in the higher-order SCTM_CTCR_WT_j or SCTM_CTCR_WOT_j register are ignored.
Chained counters can function in counter mode only. Timer mode is not supported.