Rev. 1.0, 09/01, page 305 of 904
Figure 7.31 shows an example of single address mode transfer activated by the
'5(4
pin low
level.
ø
Bus release
DMA single
Address bus
DMA control
Channel
[2]
Transfer source/
destination
Idle
Idle
Idle
[1]
[3]
[5]
[4]
[6]
[7]
Acceptance resumes
Acceptance resumes
Bus release
DMA single
Bus
release
Transfer source/
destination
Request
Request
Request clear
period
Request clear
period
Single
Single
Minimum of
2 cycles
Minimum of
2 cycles
[1]
Acceptance after transfer enabling; the
pin low level is sampled on the rising edge of ø,
and the request is held.
[2] [5] The request is cleared at the next bus break, and activation is started in the DMAC.
[3] [6] The DMAC cycle is started.
[4] [7] Acceptance is resumed after the single cycle is completed.
(As in [1], the
pin low level is sampled on the rising edge of ø, and the request is held.)
Note: In write data buffer mode, bus breaks from [2] to [7] may be hidden, and not visible.
Figure 7.31 Example of
'5(4
'5(4
'5(4
'5(4
Pin Low Level Activated Single Address Mode Transfer
'5(4
pin sampling is performed every cycle, with the rising edge of the next ø cycle after the
end of the DMABCR write cycle for setting the transfer enabled state as the starting point.
When the
'5(4
pin low level is sampled while acceptance by means of the
'5(4
pin is
possible, the request is held in the DMAC. Then, when activation is initiated in the DMAC, the
request is cleared. After the end of the single cycle, acceptance resumes,
'5(4
pin low level
sampling is performed again, and this operation is repeated until the transfer ends.
Содержание H8S/2376 F-ZTAT
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