Skip to main content
Knowledgebase
Home
Renesas Electronics America - Knowledgebase

Would DMA initiates if the timer interrupt request bit is 1?

Latest Updated:03/15/2012

Question:

The timer interrupt request is selected as a DMA request factor. In this condition, if the timer underflows (overflows) when the timer interrupt request bit is "1", won't the DMA be initiated?

Answer:

The DMAC has a DMA request bit, independent of the timer interrupt request bit which is the request factor. The DMA request bit is cleared when DMA is initiated. Regardless of the state of the timer interrupt request bit, the DMA request bit is set again at the next timer underflow (overflow) and DMA will be initiated.
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