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Is there an effect on DMA transfer when DMA request bit is set?

Latest Updated:03/15/2012

Question:

Is there any effect on a DMA transfer when the DMA request bit is set during the transfer?

Answer:

No, there is no effect on a current DMA transfer.
After a DMA request is generated, when a DMA request is generated again before the first DMA transfer starts, the second request is ignored.
When the second DMA request is generated after the first DMA transfer starts, the second request is held and the second DMA transfer will be initiated after the first transfer is completed.
Suitable Products
M32C/8A
M32C/88
M32C/87
M32C/85
M32C/84
M32C/83
M32C/80
M16C/62A
M16C/62A(M16C/62T)
M16C/62M
M16C/62N
M16C/62N(M3062GF8NFP, M3062GF8NGP)
M16C/62P
M16C/63
M16C/64A
M16C/64C
M16C/65
M16C/65C
M16C/6C
M16C/6N4, M16C/6N5
M16C/6NK, M16C/6NL, M16C/6NM, M16C/6NN
M16C/5L, M16C/56
M16C/5LD, M16C/56D
M16C/5M, M16C/57
M16C/30P
M16C/29
M16C/28
M16C/26A