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H8SX/1665MZ Group Hardware Manual - Renesas Electronics

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Section 1 Overview<br />

Classification<br />

DMA<br />

External bus<br />

extension<br />

Module/<br />

Function<br />

EXDMA<br />

controller<br />

(EXDMAC)<br />

DMA<br />

controller<br />

(DMAC)<br />

Data<br />

transfer<br />

controller<br />

(DTC)<br />

Bus<br />

controller<br />

(BSC)<br />

Description<br />

• Two-channel DMA transfer available<br />

• Two activation methods (auto-request and external request)<br />

• Four transfer modes (normal, repeat, block, and cluster<br />

transfer)<br />

• Dual or single address mode selectable<br />

• Extended repeat area function<br />

• Four-channel DMA transfer available<br />

• Three activation methods (auto-request, on-chip module<br />

interrupt, and external request)<br />

• Three transfer modes (normal, repeat, and block)<br />

• Dual or single address mode selectable<br />

• Extended repeat area function<br />

• Allows DMA transfer over 78 channels (number of DTC<br />

activation sources)<br />

• Activated by interrupt sources (chain transfer enabled)<br />

• Three transfer modes (normal transfer, repeat transfer, block<br />

transfer)<br />

• Short-address mode or full-address mode selectable<br />

• 16-Mbyte external address space<br />

• The external address space can be divided into eight areas,<br />

each of which is independently controllable<br />

⎯ Chip-select signals (CS0 to CS7) can be output<br />

⎯ Access in two or three states can be selected for each area<br />

⎯ Program wait cycles can be inserted<br />

⎯ The period of CS assertion can be extended<br />

⎯ Idle cycles can be inserted<br />

• Bus arbitration function (arbitrates bus mastership among the<br />

internal CPU, DMAC, EXDMAC, DTC, Refresh, and external<br />

bus masters)<br />

Rev. 1.00 Jan. 29, 2010 Page 4 of 1402<br />

REJ09B0597-0100

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