 irq is acknowledged by _C_isr_handler, before the first handler is invoked; This is necessary as the first context switch, due to the kernel tick handler, will move the execution away from the _C_isr_handler and never return.
 irq is acknowledged by _C_isr_handler, before the first handler is invoked; This is necessary as the first context switch, due to the kernel tick handler, will move the execution away from the _C_isr_handler and never return.

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