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H8S/2225 数据表(PDF) 270 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) 270 Page - Renesas Technology Corp

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Section 7 Bus Controller
Rev. 5.00 Aug 08, 2006 page 184 of 982
REJ09B0054-0500
8-Bit 3-State Access Space: Figure 7.11 shows the bus timing for an 8-bit 3-state access space.
When an 8-bit access space is accessed, the upper half (D15 to D8) of the data bus is used.
Wait states can be inserted.
Bus cycle
T1
T2
Address bus
φ
CSn
AS
RD
D15 to D8
Valid
D7 to D0
Invalid
Read
HWR
LWR
(16-bit bus
mode)
D15 to D8
Valid
D7 to D0
Write
High
Note: n = 7 to 0
T3
High impedance
High impedance
LWR
(8-bit bus
mode)
Figure 7.11 Bus Timing for 8-Bit 3-State Access Space



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