HD6412350 Hitachi, HD6412350 Datasheet - Page 279

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

Full Address Mode (Block Transfer Mode): Figure 7-22 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.
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.
Address bus
TEND
Figure 7-22 Example of Full Address Mode (Block Transfer Mode) Transfer
Bus release
HWR
LWR
RD
ø
DMA
read
DMA
write
Block transfer
DMA
read
DMA
write
DMA
dead
Bus release
DMA
read
DMA
write
Last block transfer
DMA
read
DMA
write
DMA
dead
Bus
release
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