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H8SX/1663M 데이터시트(PDF) 553 Page - Renesas Technology Corp

부품명 H8SX/1663M
상세설명  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

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Section 11 EXDMA Controller (EXDMAC)
Rev. 2.00 Sep. 24, 2008 Page 521 of 1468
REJ09B0412-0200
B
φ
EDACK
Bus cycle
ETEND
CPU cycle
EXDMA single
transfer cycle
EXDMA single
transfer cycle
EXDMA single
transfer cycle
External
space
External space
External space
External space
CPU cycle
CPU cycle
CPU cycle
One bus cycle
Last transfer cycle
CPU operation
Figure 11.40 Auto-Request/Normal Transfer Mode/Cycle Steal Mode
(CPU Cycles/Single Address Mode)
(2)
Auto-Request/Normal Transfer Mode/Burst Mode
With auto-request (in burst mode), when the DTE bit is set to 1 in EDMDR, an EXDMA transfer
cycle is started a minimum of three cycles later. Once transfer is started, it continues (as a burst)
until the transfer end condition is satisfied. Transfer requests for other channels are held pending
until the end of transfer on the current channel.
Figures 11.41 to 11.43 show operation timing examples for various conditions.
CPU cycle
CPU cycle
CPU cycle
EXDMAC
read
EXDMAC
write
EXDMAC
read
EXDMAC
write
EXDMAC
read
EXDMAC
write
Repeated
External
space
External space
External
space
1
B
φ
Bus cycle
CPU operation
ETEND
DTE bit
Last transfer cycle
0
Figure 11.41 Auto-Request/Normal Transfer Mode/Burst Mode
(CPU Cycles/Dual Address Mode)



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