Section 6 Bus Controller
Rev. 3.00 Jan 25, 2006 page 122 of 872
REJ09B0286-0300
6.4.3
Normal Mode
The external address space is initialized as the basic bus interface and a 3-state access space. In
mode 3 (normal mode), the address space other than on-chip ROM, on-chip RAM, internal I/O
registers, and their reserved areas is specified as the external address space. The on-chip RAM
area is enabled when the RAME bit in SYSCR is set to 1, and disabled and specified as the
external address space when the RAME bit is cleared to 0.
6.4.4
I/O Select Signals
The LSI can output I/O select signals (
IOS
); the signal is driven low when the corresponding
external address space is accessed. Figure 6.2 shows an example of
IOS
signal output timing.
Bus cycle
T
1
T
2
Address bus
φ
IOS
T
3
External addresses selected by IOS
Figure 6.2
IOS
IOS
IOS
IOS
Signal Output Timing
Enabling or disabling
IOS
signal output is performed by the IOSE bit in SYSCR. In extended
mode, the
IOS
pin functions as an
AS
pin by a reset. To use this pin as an
IOS
pin, set the IOSE
bit to 1. For details, refer to section 9, I/O Ports.
The address ranges of the
IOS
signal output can be specified by the IOS1 and IOS0 bits in BCR,
as shown in table 6.8.
Table 6.8
Address Range for
IOS
IOS
IOS
IOS
Signal Output
IOS1
IOS0
IOS
IOS
IOS
IOS
Signal Output Range
0
H'(FF)F000 to H'(FF)F03F
0
1
H'(FF)F000 to H'(FF)F0FF
0
H'(FF)F000 to H'(FF)F3FF
1
1
H'(FF)F000 to H'(FF)F7FF
(Initial value)
Содержание H8S/2158
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Страница 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Страница 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
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Страница 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Страница 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...