279
Figure 8-30 shows a transfer example in which
TEND
output is enabled and word-size single
address mode transfer (write) is performed from an external device to external 8-bit, 2-state access
space.
DMA write
ø
Address bus
DMA write
DMA write
DMA
dead
HWR
TEND
DACK
Bus
release
LWR
Bus
release
Bus
release
Bus
release
Last transfer
cycle
Figure 8-30 Example of Single Address Mode (Word Write) Transfer
A one-byte or one-word 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 (the cycle in which the transfer counter reaches 0), a one-state DMA dead
cycle is inserted after the DMA write cycle.
Содержание H8S/2631
Страница 28: ...xviii Appendix G Package Dimensions 1154 ...
Страница 341: ...316 Transfer SAR or DAR DAR or SAR Block area First block Nth block Figure 9 8 Memory Mapping in Block Transfer Mode ...
Страница 918: ...905 ø DREQ0 DREQ1 tDRQS tDRQH Figure 25 19 DMAC DREQ Input Timing ...
Страница 955: ...943 A 2 Instruction Codes Table A 2 shows the instruction codes ...