Fujitsu MB91460 SERIES 애플리케이션 노트 - 페이지 6

{카테고리_이름} Fujitsu MB91460 SERIES에 대한 애플리케이션 노트을 온라인으로 검색하거나 PDF를 다운로드하세요. Fujitsu MB91460 SERIES 29 페이지. 32-bit microcontroller
Fujitsu MB91460 SERIES에 대해서도 마찬가지입니다: 사용자 설명서 (45 페이지), 시작하기 (41 페이지), 애플리케이션 노트 (23 페이지), 애플리케이션 노트 (26 페이지), 애플리케이션 노트 (29 페이지)

페이지 인쇄

1 Introduction

This application note describes the functionality of the Direct Memory Access Controller

(DMAC) and gives some examples.

The DMAC is mainly used to transfer data between a source and a destination memory

location without any CPU load. The direction can be from resource (peripheral) to memory

and vice versa. This transfer can be a single transfer or multiple transfers from single

address or an address area. DMA is always triggered by a resource interrupt and does not

interrupt the CPU until the transfer has ended.

1.1 Key Features

•

Byte / Half-word / Word Transfer

•

Transfer from External Area / Built-in I/O / Internal RAM to External Area / Built-in I/O

/ Internal RAM

•

Entire space of 32-bit is addressable

•

Step / Block / Bulk / Demand Transfers with possibility of update (increment or

decrement) of source and destination address with Reload

•

Block Count and Transfer Count (with reload) registers available

•

External input pin or built-in peripherals or software requests as DMAC transfer

request sources

•

External Transfer requests available on DMAC channels 0 to 3

•

DMA can be stopped by STOP request (supported by UART-Receive interrupt, in

case of receive error)

MCU-AN-300059-E-V11

DIRECT MEMORY ACCESS

Chapter 1 Introduction

- 6 -