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SH7021 Datasheet(PDF) 217 Page - Renesas Technology Corp

Part # SH7021
Description  SuperH??RISC engine
PDF  509 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7021 Datasheet(HTML) 217 Page - Renesas Technology Corp

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200 RENESAS
CK
DREQ
DACK
Bus cycle
CPU
CPU
CPU
DMAC
CPU
CPU
CPU
CPU
Figure 9.15
DREQ Sampling Timing in Cycle Steal Mode (Output with DREQ level
detection and DACK active low) (Single address mode, bus cycle = 2 states)
CK
DREQ
DACK
Bus cycle
CPU
CPU
CPU
DMAC (R) DMAC (W)
CPU
CPU
CPU
DMAC (R): DMAC read cycle
DMAC (W): DMAC write cycle
Note:
Illustrates the case when DACK is output during the DMAC write cycle.
Figure 9.16
DREQ Sampling Timing in Cycle Steal Mode (Output with DREQ level
detection and DACK active low) (Dual address mode, bus cycle = 2 states)



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