Section 6 Bus Controller (BSC)
Rev. 1.00 Mar. 12, 2008 Page 120 of 1178
REJ09B0403-0100
(2) In Address-Data Multiplex Extended Mode
(a) Bus
Width
A bus width of 8 or 16 bits can be selected via the ABW and ABW256 bits in WSCR.
(b) Number of Access States
Two or three states can be selected for data access via the AST and AST256 bits in WSCR. When
the 2-state access space is designated, wait-state insertion is disabled.
(c)
Wait Mode and Number of Program Wait States
•
IOS Extended Area
When the IOS extended area is specified as a 3-state access space by the AST bit in WSCR,
the wait mode and the number of program wait states to be inserted automatically is selected
by the WMS1, WMS0, WC1, and WC0 bits in WSCR. Zero or one program wait state can be
inserted into address cycle. From zero to three program wait states can be selected for data
cycle.
•
256-Kbyte Extended Area
When the 256-Kbyte extended area is specified as a 3-state access space by the AST256 bit in
WSCR, the wait mode and the number of program wait states to be inserted automatically is
selected by the WMS10, WC11, and WC10 bits in WSCR2. Zero or one program wait state
can be inserted into address cycle. From zero to three program wait states can be selected for
data cycle.
The wait function for external extension is effective for connecting low-speed devices to the
external address space. However, this wait function may cause some problems when the operation
of bus masters other than the CPU, such as the DTC, are to be delayed.
Tables 6.6 to 6.11 show address-data multiplex address space and the bus specifications for the
basic bus interface of each area.
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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