h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 137

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

6.4.3
The external address space bus specifications consist of five elements: bus width, number of
access states, number of program wait states, read strobe timing, and chip select (CS) assertion
period extension states. The bus width and number of access states for on-chip memory and
internal I/O registers are fixed, and are not affected by the bus controller.
Bus Width: A bus width of 8 or 16 bits can be selected with ACSCR. An area for which an 8-bit
bus is selected functions as an 8-bit access space, and an area for which a 16-bit bus is selected
functions as a 16-bit access space.
Bus Specifications
H'000000
H'040000
H'200000
H'400000
H'E00000
H'FF7000
H'FFF000
H'FFFC00
H'FFFFFF
Figure 6.7 Address Map
On-chip ROM
On-chip RAM
I/O
Area 0
Area 1
Area 2
Area 3
Rev. 2.00, 03/04, page 105 of 534