SH7014 datasheet(199/754 Pages) RENESAS

199 / 754 page

9. Direct Memory Access Controller (DMAC)

Rev.5.00 Sep. 27, 2007 Page 165 of 716

REJ09B0398-0500

When an on-chip peripheral module's interrupt request signal is used as a DMA transfer request

signal, interrupts for the CPU are not generated.

When a DMA transfer is conducted corresponding with one of the transfer request signals in table

9.4, it is automatically discontinued. In cycle steal mode this occurs in the first transfer, and in

burst mode with the last transfer.

9.3.3

Channel Priority

When the DMAC receives simultaneous transfer requests on two or more channels, it selects a

channel according to a predetermined priority order. The channel priority order is fixed at channel

0 > channel 1.

9.3.4

DMA Transfer Types

The DMAC supports the transfers shown in table 9.5. It can operate in the single address mode, in

which either the transfer source or destination is accessed using an acknowledge signal, or dual

address mode, in which both the transfer source and destination addresses are output. The DMAC

has two bus modes: cycle-steal mode and burst mode.

Table 9.5

Supported DMA Transfers

Destination

Source

External Device

with DACK

External

Memory

Memory-

Mapped

External

Device

On-Chip

Memory

On-Chip

Peripheral

Module

External device with DACK Not available

Single

Not available

External memory

Single

Dual

Memory-mapped external

device

Single

Dual

On-chip memory

Not available

Dual

On-chip peripheral module

Not available

Dual

Notes: 1. Single: Single address mode

2. Dual: Dual address mode

SH7014 Datasheet(PDF) 199 Page - Renesas Technology Corp

SH7014 Datasheet(HTML) 199 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL