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H8S/2218 数据表(PDF) 185 Page - Renesas Technology Corp

部件名 H8S/2218
功能描述  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  750 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/2218 数据表(HTML) 185 Page - Renesas Technology Corp

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Section 6 Bus Controller
Rev.6.00 Jun. 03, 2008 Page 137 of 698
REJ09B0074-0600
8-Bit 3-State Access Space (Except Area 6): Figure 6.11 shows the bus timing for an 8-bit 3-
state access space in the H8S/2218 Group. 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 = 0 to 5
T3
High impedance
High impedance
LWR
(8-bit bus
mode)
Figure 6.11 Bus Timing for 8-Bit 3-State Access Space (Except Area 6)



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