Fujitsu FR60 Hardware Manual page 429

CHAPTER 14 DMA CONTROLLER (DMAC)
■ Software Request
A transfer request is generated by writing to the trigger bit of a register (STRG of DMACA).
The software request is independent of the external transfer request pin and built-in peripheral
request and can always be caused.
If a software request occurs together with a start (transfer enable) request, the transfer is started
by immediate output of a DMA transfer request to the bus controller.
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