Rev. 1.0, 09/01, page 363 of 904
If a transfer request is generated for another channel, an EXDMA cycle for the other channel is
generated before the next EXDMA cycle.
The
('5(4
pin sensing timing is different for low level sensing and falling edge sensing. The
same applies to transfer request acceptance and transfer start timing.
Figures 8.35 to 8.38 show operation timing examples for various conditions.
ø pin
Bus cycle
EDA bit
Bus release
Bus release
Bus release
EXDMA
read
EXDMA
write
EXDMA
read
EXDMA
write
0
1
Last transfer cycle
3 cycles
Figure 8.35 External Request/Cycle Steal Mode/Normal Transfer Mode
(No Contention/Dual Address Mode/Low Level Sensing)
Содержание H8S/2376 F-ZTAT
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