Rev. 1.0, 09/01, page 338 of 904
CPU
CPU
CPU
CPU
Bus cycle
EXDMAC operates alternately with CPU
EXDMAC
EXDMAC
EXDMAC
Transfer conditions:
Auto request mode, BGUP = 1
CPU
CPU
CPU
CPU
Bus cycle
CPU cycle not generated
EXDMAC
EXDMAC
EXDMAC
Transfer conditions:
Auto request mode, BGUP = 0
Figure 8.6 Examples of Timing in Burst Mode
8.4.5
Transfer Modes
There are two transfer modes: normal transfer mode and block transfer mode. When the activation
source is an external request, either normal transfer mode or block transfer mode can be selected.
When the activation source is an auto request, normal transfer mode is used.
Normal Transfer Mode: In normal transfer mode, transfer of one transfer unit is processed in
response to one transfer request. EDTCR functions as a 24-bit transfer counter.
The
(7(1'
signal is output only for the last DMA transfer. The
('5$.
signal is output each
time a transfer request is accepted and transfer processing is started.
Figure 8.7 shows examples of DMA transfer timing in normal transfer mode.
Содержание H8S/2376 F-ZTAT
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