HD6432351 datasheet(268/1025 Pages) RENESAS

268 / 1025 page

Section 7 DMA Controller (DMAC)

Rev. 3.00 Sep 15, 2006 page 234 of 988

REJ09B0330-0300

Operation in each mode is summarized below.

(1) Sequential mode

In response to a single transfer request, the specified number of transfers are carried out, one byte

or one word at a time. An interrupt request can be sent to the CPU or DTC when the specified

number of transfers have been completed. One address is specified as 24 bits, and the other as 16

bits. The transfer direction is programmable.

(2) Idle mode

In response to a single transfer request, the specified number of transfers are carried out, one byte

or one word at a time. An interrupt request can be sent to the CPU or DTC when the specified

number of transfers have been completed. One address is specified as 24 bits, and the other as 16

bits. The transfer source address and transfer destination address are fixed. The transfer direction

is programmable.

(3) Repeat mode

In response to a single transfer request, the specified number of transfers are carried out, one byte

or one word at a time. When the specified number of transfers have been completed, the addresses

and transfer counter are restored to their original settings, and operation is continued. No interrupt

request is sent to the CPU or DTC. One address is specified as 24 bits, and the other as 16 bits.

The transfer direction is programmable.

(4) Single address mode

In response to a single transfer request, the specified number of transfers are carried out between

external memory and an external device, one byte or one word at a time. Unlike dual address

mode, source and destination accesses are performed in parallel. Therefore, either the source or the

destination is an external device which can be accessed with a strobe alone, using the

DACK pin.

One address is specified as 24 bits, and for the other, the pin is set automatically. The transfer

direction is programmable.

Modes (1), (2) and (3) can also be specified for single address mode.

HD6432351 Datasheet(PDF) 268 Page - Renesas Technology Corp