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Do DTC execute if interrupted in lower on process of higher interrupt?

Latest Updated:03/23/2009

Question:

When H8S/2345 has a DTC request from a lower priority interrupt during the processing of higher priority interrupt, does DTC execute immediately, or does the DTC start after the higher priority interrupt?

Answer:

The DTC starts immediately as it is one of the bus masters, the CPU is also a bus master. Both have precedence for bus access and DTC takes precedence over CPU. Bus master access has priority over interrupts.
Suitable Products
H8S/2345