HD6417618 RENESAS [Renesas Technology Corp], HD6417618 Datasheet - Page 224
HD6417618
Manufacturer Part Number
HD6417618
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417618.pdf
(646 pages)
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Section 7 Bus State Controller (BSC)
In read cycles, the CPU is placed in the wait cycle until read operation has been completed. To
continue the process after the data write to the device has been completed, perform a dummy read
to the same address to check for completion of the write before the next process to be executed.
The write buffer of the BSC functions in the same way for an access by a bus master other than the
CPU such as the DMAC or E-DMAC. Accordingly, to perform dual address DMA transfers, the
next read cycle is initiated before the previous write cycle is completed. Note, however, that if
both the DMA source and destination addresses exist in external memory space, the next write
cycle will not be initiated until the previous write cycle is completed.
On-Chip Peripheral Module Access: To access an on-chip module register, two or more
peripheral module clock (Pφ) cycles are required. Care must be taken in system design.
Rev. 6.00 Jun. 12, 2007 Page 192 of 610
REJ09B0131-0600
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