Section 6 Bus Controller (BSC)
Rev. 1.00 Mar. 12, 2008 Page 112 of 1178
REJ09B0403-0100
6.3.3
Wait State Control Register (WSCR)
WSCR is used to specify the data bus width, the number of access states, the wait mode, and the
number of wait states for access to external address spaces (basic extended area and 256-Kbyte
extended area). The bus width and the number of access states for internal memory and internal
I/O registers are fixed regardless of the WSCR settings.
Bit Bit
Name
Initial
Value
R/W Description
7
ABW256
1
R/W
256-Kbyte Extended Area Bus Width Control
Selects the bus width for access to the 256-Kbyte
extended area when the CS256E bit in SYSCR is set to 1.
0: 16-bit bus
1: 8-bit bus
6
AST256
1
R/W
256-Kbyte Extended Area Access State Control
Selects the number of states for access to the 256-Kbyte
extended area when the CS256E bit in SYSCR is set to 1.
This bit also enables or disables wait-state insertion.
[ADMXE = 0] Normal extension
0: 2-state access space. Wait state insertion disabled
1: 3-state access space. Wait state insertion enabled
[ADMXE = 1] Address-data multiplex extension
0: 2-state data access space. Wait state insertion disabled
1: 3-state data access space. Wait state insertion enabled
5
ABW
1
R/W
Basic Extended Area Bus Width Control
Selects the bus width for access to the basic extended
area.
0: 16-bit bus
1: 8-bit bus
When the CS256E bit in SYSCR is set to 1, this bit setting
is ignored in access to the 256-Kbyte extended 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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