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7733 bảng dữ liệu(PDF) 705 Page - Renesas Technology Corp

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Giải thích chi tiết về linh kiện  16-BIT SINGLE-CHIP MICROCOMPUTER
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nhà sản xuất  RENESAS [Renesas Technology Corp]
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CONNECTING EXTERNAL DEVICES
7735 Group User’s Manual
12–29
Œ When “L” level which is input to pin HOLD is the accepted, the address which was output
immediately before is output again, instead of a new address.
 Sampling is not performed until 16-bit data input/output is finished. ( “L” level which is
input to pin HOLD is not accepted.)
External address bus/
External data bus
ALE
HLDA
HOLD
Address
1
! 1
1
! 1
Hold state
Not sampled

External data bus
Data length
External data bus width
Software wait
16
8
16
(When accessed starting from even address)
No wait
In use
q State when “L” level is input to pin HOLD
Sampling timing
Bus is in use.
<<When “L” level is input to pin HOLD while bus is in use (4)>>
External address bus
Clock
1
Data
High-order address
Floating
Floating
Floating
Œ
Bus is in use.
BHE
Data
Low-order address
g
CS0 to CS4
g RDE, WEL, WEH
Bus is not in use.
Fig. 12.4.6 Timing when hold state is accepted and terminated (5)
12.4 Hold function



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