H8SLASH3003 datasheet(193/715 Pages) RENESAS

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8.1.3 Functional Overview

Table 8-1 gives an overview of the DMAC functions.

Table 8-1 DMAC Functional Overview

Address

Reg. Length

Destina-

Transfer Mode

Activation

Source tion

• Compare match/input

capture A interrupts

from ITU channels

0 to 3

• Transmit-data-empty

interrupt from serial

communication

interface

• Receive-data-full

interrupt from serial

communication

interface

• External request

• Auto-request

• External request

• Compare match/

input capture A

interrupts from ITU

channels 0 to 3

• External request

I/O mode

• Transfers one byte or one word

per request

• Increments or decrements the

memory address by 1 or 2

• Executes 1 to 65,536 transfers

Idle mode

• Transfers one byte or one word

per request

• Holds the memory address fixed

• Executes 1 to 65,536 transfers

Repeat mode

• Transfers one byte or one word

per request

• Increments or decrements the

memory address by 1 or 2

• Executes a specified number (1 to

255) of transfers, then returns to

the initial state and continues

Normal mode

• Auto-request

— Retains the transfer request

internally

— Executes a specified number

(1 to 65,536) of transfers

continuously

— Selection of burst mode or

cycle-steal mode

• External request

— Transfers one byte or one word

per request

— Executes 1 to 65,536 transfers

Block transfer

• Transfers one block of a specified

size per request

• Executes 1 to 65,536 transfers

• Allows either the source or

destination to be a fixed block

area

• Block size can be 1 to 255 bytes

or words

Short

address

mode

Full

address

mode

175

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