HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 157
HD6432160
Manufacturer Part Number
HD6432160
Description
Hitachi 16-Bit Single-Chip Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6432160.pdf
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6.4
6.4.1
The external address space bus specifications consist of three elements: Bus width, the number of
access states, and the wait mode and the number of program wait states. The bus width and the
number of access states for on-chip memory and internal I/O registers are fixed, and are not
affected by the bus controller settings.
Bus Width: A bus width of 8 or 16 bits can be selected via the ABW bit in WSCR.
Number of Access States: Two or three access states can be selected via the AST bit in WSCR.
When the 2-state access space is designated, wait-state insertion is disabled.
In the burst ROM interface, the number of access states is determined regardless of the AST bit
setting.
Wait Mode and Number of Program Wait States: When a 3-state access space is designated 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. From 0 to 3
program wait states can be selected.
Bus Control
Bus Specifications
Rev. 2.0, 08/02, page 117 of 788
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