r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 34

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 1 Overview
Rev. 1.00 Sep. 19, 2008 Page 4 of 1342
REJ09B0467-0100
Type
DMA
External
bus
extension
Module/
Function
DMA controller
(DMAC)
EXDMA controller
(EXDMAC)
Data transfer
controller (DTC)
Bus controller
(BSC)
Description
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Note: EXDMAC is supported only by the H8S/2456 Group and
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DMA transfer is possible on four channels
Three activation sources (auto-request, on-chip module
interrupt, and external request)
Byte or word can be set as the transfer unit
Short address mode or full address mode can be selected
16-Mbyte address space can be specified directly
DMA transfer is possible on two channels
Two activation sources (auto-request and external request)
Two transfer modes (normal mode and block transfer mode)
Dual address mode or single address mode can be selected
16-Mbyte address space can be specified directly
Repeat area can be set
Transfer is possible on any number of channels
An interrupt source can trigger data transfer (chain transfer is
possible)
Three transfer modes (normal mode, repeat mode, and block
transfer mode)
Byte or word can be set as the transfer unit
Activation by software is possible
External address space: 16 Mbytes
Manages the external address space divided into eight areas
Chip select signals (CS0 to CS7) can be output
8-bit access or 16-bit access can be selected
2-state access or 3-state access can be selected
Program wait states can be inserted
External memory interfaces (burst ROM, DRAM, synchronous
DRAM*
Bus arbitration function (bus arbitration of the bus masters
CPU, DTC, DMAC, and EXDMAC)
H8S/2456R Group.
1
, address/data multiplexed I/O)