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H8S/2225 数据表(PDF) 276 Page - Renesas Technology Corp

部件名 H8S/2225
功能描述  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  1071 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8S/2225 数据表(HTML) 276 Page - Renesas Technology Corp

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Section 7 Bus Controller
Rev. 5.00 Aug 08, 2006 page 190 of 982
REJ09B0054-0500
Bus cycle
T1
T2
Address bus
φ
CSn
AS
RD
D15 to D8
Valid
D7 to D0
Valid
Read
HWR
LWR
D15 to D8
Valid
D7 to D0
Valid
Write
Note: n = 7 to 0
T3
Figure 7.17 Bus Timing for 16-Bit 3-State Access Space (3) (Word Access)
7.6.4
Wait Control
When accessing external space, this LSI can extend the bus cycle by inserting one or more wait
states (Tw). There are two ways of inserting wait states: program wait insertion and pin wait
insertion using the
WAIT pin.
(1) Program Wait Insertion
From 0 to 3 wait states can be inserted automatically between the T2 state and T3 state on an
individual area basis in 3-state access space, according to the settings of WCRH and WCRL.



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