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7733 データシート(PDF) 349 Page - Renesas Technology Corp

部品番号 7733
部品情報  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  940 Pages
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メーカー  RENESAS [Renesas Technology Corp]
ホームページ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7733 データシート(HTML) 349 Page - Renesas Technology Corp

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CONNECTING EXTERNAL DEVICES
7733 Group User’s Manual
12–24
12.4 Hold function
Œ When “L” level which is input to pin HOLD is accepted, the address which was output
immediately before is output again, instead of a new address.
External data bus
Data length
External data bus width
Software wait
8
16
8,16
16
(When accessed starting from even address)
Wait 0
In use
q State when “L” level is input to pin HOLD
ALE
E
HLDA
HOLD
R/W
Address A
Address B
1
! 1
1
! 1
Hold state
Data
Sampling timing
Bus is in use.
<<When “L” level is input to pin HOLD while bus is in use (3)>>
External address bus/
External data bus
External address bus
Clock
1
Address A
Floating
Floating
Bus is in use.
Floating
BHE
Œ
Fig. 12.4.5 Timing when hold state is accepted and terminated (4)



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