Renesas H8S/2111B Manual de usuario descargar pdf (Pagina 11)

Peripherals

H8 Peripherals

9

■ DMA Controller (DMAC)

• Max. of 4 channels can be used

• Dual-address or single-address

mode can be selected

• Supports Single, Burst, Sequential,

Idle and Repeat Transfer modes

• Data can be transferred in word

or byte units

• Activation: internal interrupt,

external request, auto-request

■ Data Transfer Controller (DTC)

• Max. of 85 channels can be used

• Multiple transfers or multiple

types of transfers possible for

one activation source

• Supports Single, Burst, Chain and

Repeat Transfer modes

• Data can be transferred in byte or

word units

• Activation sources: interrupt and

software

■ External DMA Controller

(ExDMAC)

• Max. of 4 channels can be used

• Selection of byte or word transfer

data length

• Transfer data in parallel with CPU

or other internal bus master

• Dual-address or single-address

mode can be selected

• Supports Single, Burst, Sequential,

Idle and Repeat Transfer modes

• Data can be transferred in word

or byte units

• Activation: internal interrupt,

external request, auto-request

DTC

service

request

Interrupt

controller

On-chip 1KB RAM

Channel n

Interrupt

request

n + 1

n + 2

Source

Memory data

Destination

DMA Register

Source

Serial I/O

Destination

Memory

Data Transfer Controller: Chain Transfer Mode

Address bus

A15 to A0

External

memory

External

device

(Read)

(Write)

Address bus

Data bus

RD

HWR, LWR

A23 to A0

H8S/2633

DACK

Single-Address Mode

(Parallel read and write)

External

memory

External

device

Read (1st cycle)

RD

HWR, LWR

H8S/2633

Dual-Address Mode

(Two-cycle read and write)

Address bus

A23 to A0

BUFFER

D15 to D0

Write (2nd cycle)

Data bus

D15 to D0

DMA Controller Block Diagram

ExDMA Controller Block Diagram

Data flow

External

address bus

External

data bus

EXDMAC

EDACK

EDREQ

External

memory

External device

with DACK

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