r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 32

• Manufacturer Part Number: r4f2426
• 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 1270
REJ09B0466-0100
Type
DMA
External
bus
extension
Clock
Module/
Function
EXDMA controller
(EXDMAC)
Data transfer
controller (DTC)
Bus controller
(BSC)
Clock pulse
generator (CPG)
Description
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Note:
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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)
This LSI has a single on-chip clock pulse generator circuit
Consists of an oscillator, a system-clock PLL circuit, a divider,
and the system clock frequency can be changed
System clock (φ) cycle: 8 to 33 MHz
Six power-down modes
Divided clock mode, sleep mode, module stop function, all
module clock stop mode, software standby mode, and
hardware standby mode
*
1
EXDMAC is supported only by the H8S/2426 Group
and H8S/2426R Group.
, address/data multiplexed I/O)