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HD64F2149YV bảng dữ liệu(PDF) 175 Page - Renesas Technology Corp

tên linh kiện HD64F2149YV
Giải thích chi tiết về linh kiện  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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Section 6 Bus Controller
Rev. 3.00 Jan 18, 2006 page 147 of 1044
REJ09B0280-0300
6.3.4
I/O Select Signal
In the H8S/2169 or H8S/2149, an I/O select signal (
IOS) can be output, with the signal output
going low when the designated external space is accessed.
Figure 6.2 shows an example of
IOS signal output timing.
φ
Address bus
IOS
T1
T2
T3
Bus cycle
External address in IOS set range
Figure 6.2
IOS
IOS
IOS
IOS Signal Output Timing
Enabling or disabling of
IOS signal output is controlled by the setting of the IOSE bit in SYSCR.
In expanded mode, this pin operates as the
AS output pin after a reset, and therefore the IOSE bit
in SYSCR must be set to 1 in order to use this pin as the
IOS signal output. See section 8, I/O
Ports, for details.
The range of addresses for which the
IOS signal is output can be set with bits IOS1 and IOS0 in
BCR. The
IOS signal address ranges are shown in table 6.4.
Table 6.4
IOS
IOS
IOS
IOS Signal Output Range Settings
IOS1
IOS0
IOS
IOS
IOS
IOS Signal Output Range
0
0
H'(FF)F000 to H'(FF)F03F
1
H'(FF)F000 to H'(FF)F0FF
1
0
H'(FF)F000 to H'(FF)F3FF
1
H'(FF)F000 to H'(FF)F7FF
(Initial value)



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