Rev. 1.0, 09/01, page 358 of 904
Single
Single
DMA single
ø
Address bus
Idle
Bus release
DMA control
Channel
Transfer source/
destination
Transfer source/
destination
Bus release
Idle
DMA single Bus release
Idle
[1]
[3]
[2]
[4]
[6]
[5]
[7]
Acceptance
resumed
Acceptance
resumed
Request
clearance period
Request
clearance period
Request
Request
Minimum 3 cycles
Minimum 3 cycles
[1]
Acceptance after transfer enabling;
pin low level is sampled at rise of ø, and request is held.
[2], [5] Request is cleared at end of next bus cycle, and activation is started in EXDMAC.
[3], [6] DMA cycle is started.
[4], [7] Acceptance is resumed after completion of single cycle.
(As in [1],
pin low level is sampled at rise of ø, and request is held.)
Figure 8.27 Example of Single Address Mode Transfer Activated by
('5(4
('5(4
('5(4
('5(4
Pin Low Level
('5(4
pin sampling is performed in each cycle starting at the next rise of ø after the end of the
EDMDR write cycle for setting the transfer-enabled state.
When a low level is sampled at the
('5(4
pin while acceptance via the
('5(4
pin is possible,
the request is held within the EXDMAC. Then when activation is initiated within the EXDMAC,
the request is cleared. At the end of the single cycle, acceptance resumes and
('5(4
pin low
level sampling is performed again; this sequence of operations is repeated until the end of the
transfer.
Содержание H8S/2376 F-ZTAT
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