M30620FCAFP datasheet(462/615 Pages) RENESAS

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DMAC

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-145

(7) Switching function

(a) Switching between one-shot transfer and repeated transfer

'One-shot transfer' refers to a mode in which DMA is disabled after the transfer counter underflows.

'Repeated transfer' refers to a mode in which a reload is carried out after the transfer counter under-

flows. The reload is carried out for the transfer counter and on the address pointer subjected to

forward direction.

The following are examples of operation in which the options listed are selected.

• A fixed address from an arbitrary 1M byte space, one-shot transfer ..................................... P2-148

• An arbitrary 1M byte space from a fixed address, repeated transfer ..................................... P2-150

(8) Registers related to DMAC

Figure 2.9.1 shows the memory map of DMAC-related registers, and Figures 2.9.2 and 2.9.3 show

DMAC-related registers.

Figure 2.9.1. Memory map of DMAC-related registers

002016

002116

002216

002316

002416

002516

002616

002716

002816

002916

002C15

003016

003116

003216

003316

003416

003516

003616

003716

003816

003916

003C16

004B16

004C16

03B816

03B916

03BA16

DMA0 control register (DM0CON)

DMA0 source pointer (SAR0)

DMA0 transfer counter (TCR0)

DMA0 destination pointer (DAR0)

DMA1 control register (DM1CON)

DMA1 source pointer (SAR1)

DMA1 transfer counter (TCR1)

DMA1 destination pointer (DAR1)

DMA0 cause select register (DM0SL)

DMA1 cause select register (DM1SL)

DMA0 interrupt control register (DM0IC)

DMA1 interrupt control register (DM1IC)

M30620FCAFP Datasheet(PDF) 462 Page - Renesas Technology Corp

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