HD6432670 Hitachi, HD6432670 Datasheet - Page 360

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Figure 7.27 shows a transfer example in which
address mode transfer (read) is performed from external 8-bit, 2-state access space to an external
device.
A byte or word transfer is performed for a single transfer request, and after the transfer, the bus is
released. While the bus is released, one or more bus cycles are executed by the CPU or DTC.
Rev. 2.0, 04/02, page 314 of 906
Address bus
Address bus
ø
Figure 7.27 Example of Single Address Mode (Word Read) Transfer
Figure 7.26 Example of Single Address Mode Transfer (Byte Read)
release
Bus
ø
release
Bus
DMA read
DMA read
release
Bus
release
Bus
DMA read
DMA read
release
Bus
DMA read
output is enabled and word-size single
release
Bus
release
Bus
DMA read
Last transfer
DMA read
Last transfer
cycle
cycle
DMA
dead
release
DMA
dead
Bus
release
Bus