Section 6 Bus Controller (BSC)
Rev. 1.00 Mar. 12, 2008 Page 150 of 1178
REJ09B0403-0100
(2) In Address-Data Multiplex Extended Mode
(a) Program Wait Mode
Program wait mode includes address wait and data wait.
•
256-Kbyte extended area and IOS extended area
Zero or one state of address wait T
AW
is inserted between T
1
and T
2
states. Zero to three states
of data wait T
DSW
is inserted between T
4
and T
5
states.
(b) Pin Wait Mode
When accessing the external address space, a specified number of wait states T
DSW
can be inserted
between the T
4
state and T
5
state of data state. The number of wait states T
DSW
is specified by the
settings of the WC1 and WC0 bits. If the
WAIT
pin is low at the falling edge of
φ
in the last T
4
,
T
DSW
, or T
DOW
state, another T
DOW
state is inserted. If the
WAIT
pin is held low, T
DOW
states are
inserted until it goes high.
Pin wait mode is useful when inserting four or more T
DOW
states, or when changing the number of
T
DOW
states to be inserted for each external device.
(c)
Pin Auto-Wait Mode
A specified number of wait states T
DOW
are inserted between the T
4
state and T
5
state when
accessing the external address space if the
WAIT
pin is low at the falling edge of
φ
in the last T
4
state. The number of wait states T
DOW
is specified by the settings of the WC1 and WC0 bits. Even
if the
WAIT
pin is held low, T
DOW
states are inserted only up to the specified number of states.
Pin auto-wait mode enables the low-speed memory interface only by inputting the chip select
signal to the
WAIT
pin.
Figure 6.29 shows an example of wait state insertion timing in pin wait mode.
Summary of Contents for H8S Family
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Page 70: ...Section 1 Overview Rev 1 00 Mar 12 2008 Page 22 of 1178 REJ09B0403 0100...
Page 108: ...Section 2 CPU Rev 1 00 Mar 12 2008 Page 60 of 1178 REJ09B0403 0100...
Page 116: ...Section 3 MCU Operating Modes Rev 1 00 Mar 12 2008 Page 68 of 1178 REJ09B0403 0100...
Page 152: ...Section 5 Interrupt Controller Rev 1 00 Mar 12 2008 Page 104 of 1178 REJ09B0403 0100...
Page 206: ...Section 6 Bus Controller BSC Rev 1 00 Mar 12 2008 Page 158 of 1178 REJ09B0403 0100...
Page 420: ...Section 9 14 Bit PWM Timer PWMX Rev 1 00 Mar 12 2008 Page 372 of 1178 REJ09B0403 0100...
Page 476: ...Section 12 Watchdog Timer WDT Rev 1 00 Mar 12 2008 Page 428 of 1178 REJ09B0403 0100...
Page 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
Page 712: ...Section 18 I2 C Bus Interface IIC Rev 1 00 Mar 12 2008 Page 664 of 1178 REJ09B0403 0100...
Page 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Page 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
Page 964: ...Section 24 RAM Rev 1 00 Mar 12 2008 Page 916 of 1178 REJ09B0403 0100...
Page 1066: ...Section 25 Flash Memory Rev 1 00 Mar 12 2008 Page 1018 of 1178 REJ09B0403 0100...
Page 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
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Page 1230: ...H8S 2472 Group H8S 2462 Group Hardware Manual...