HD64F2145 datasheet(157/829 Pages) RENESAS

tên linh kiện	HD64F2145

Giải thích chi tiết về linh kiện	Hitachi 16-Bit Single-Chip Microcomputer

PDF	829 Pages

Scroll/Zoom	100%

nhà sản xuất	RENESAS [Renesas Technology Corp]

Trang chủ	http://www.renesas.com

Logo

157 / 829 page

Rev. 2.0, 08/02, page 117 of 788

6.4

Bus Control

6.4.1

Bus Specifications

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.

HD64F2145 bảng dữ liệu(PDF) 157 Page - Renesas Technology Corp