Datasheet

Table Of Contents
Section 7 DMA Controller (DMAC)
REJ09B0140-0900 Rev. 9.00 Page 195 of 846
Sep 16, 2010
H8S/2215 Group
Full Address Mode (Block Transfer Mode): Figure 7.19 shows a transfer example in which
TEND* output is enabled and word-size full address mode transfer (block transfer mode) is
performed from internal 16-bit, 1-state access space to external 16-bit, 2-state access space.
φ
DMA
read
RD
HWR
TEND*
LWR
DMA
write
DMA
dead
Address bus
Bus release Bus release Bus releaseLast block transfer
DMA
read
Block transfer
DMA
write
DMA
read
DMA
write
DMA
dead
DMA
read
DMA
write
Note: * TEND output cannot be used with this LSI.
Figure 7.19 Example of Full Address Mode (Block Transfer Mode) Transfer
A one-block transfer is performed for one transfer request, and after the transfer the bus is
released. While the bus is released, one or more bus cycles are inserted by the CPU or DTC.
In the transfer end cycle of each block (the cycle in which the transfer counter reaches 0), a one-
state DMA dead cycle is inserted after the DMA write cycle.
One block is transmitted without interruption. NMI generation does not affect block transfer
operation.
Note: * TEND output cannot be used with this LSI.